RobSEO, Author at CB Frost

Die-Cut vs. Waterjet Cut Silicone Gaskets

Posted on August 4, 2026August 4, 2026 by RobSEO

What’s the best choice for your production run?

Selecting the right material is critical for manufacturing high-performance seals, but how that material is converted also plays an important role in the quality, cost, and lead times of your project. Whether you are producing solid silicone rubber gaskets for an automotive enclosure or lighting seals, or compressible sponge gaskets for HVAC insulation, choosing the correct cutting method contributed to the best performance and budget efficiency.

At CB Frost & Co, we have invested heavily in our advanced manufacturing capabilities and cutting facilities. Here is a breakdown of when to choose die-cutting, high-speed kiss cutting, or waterjet cutting for your next silicone gaskets production run

When Should You Choose Die-Cutting for Silicone Gaskets?

Die-cutting uses a custom made cutting die to stamp out shapes from sheets or rolls of silicone to create gaskets. Choose die-cutting when manufacturing medium-to-high volume runs of standard solid silicone or silicone sponge gaskets. A custom steel die stamped by a high-powered press provides a fast, repeatable, and cost-effective solution that quickly absorbs initial tooling expenses across large production batches.

Selecting die-cutting allows manufacturers to produce thousands of identical seals with tight tolerances and minimal unit costs. With our tooling room, we can manufacture die-cutting formes in-house, meaning upfront tooling lead times and expenses are kept to a minimum.

	Die-Cutting
How It Works	A high-powered press forces a custom steel tool through the material, cleanly shearing out the gasket shape in a single motion.
Best For	Medium to high-volume production runs.
Material Compatibility	Highly effective for both solid silicone and silicone sponge materials (provided that the material is not too thick).
Tooling & Cost	Die cutting incurs a small upfront tooling cost to create the custom die, but high-speed output rapidly absorbs this cost over larger batches. At CB Frost, we manufacture die cutting formes on site in our Toolroom to reduce lead times and costs.
The Verdict	If you are manufacturing thousands of silicone gaskets, die-cutting is exceptionally fast, highly repeatable, and the most cost-effective option for large runs.

When is High-Speed Kiss Cutting the Right Choice?

Kiss cutting is ideal for high-volume peel-and-stick applications where assembly speed is one of the most important considerations. The process cuts through the silicone seal while leaving the continuous adhesive backing roll intact, eliminating manual sorting and allowing operators to rapidly peel and apply gaskets.

Delivering finished gaskets on continuous rolls rather than loose pieces helps streamline operations on fast-paced manufacturing floors. It is particularly effective for thinner materials applied directly to electrical enclosures, lighting units, and HVAC systems.

	Kiss-Cut Rolls
How It Works	Gaskets are cut through the silicone down to (but not through) the adhesive backing liner, delivering gaskets on a continuous roll rather than loose, individual pieces.
Best For	High volume gasket production, fast-paced assembly lines and high-speed peel-and-stick applications.
Material Compatibility	Best suited for thinner solid and sponge materials with self-adhesive backings.
Efficiency Impact	Eliminates manual sorting and backing removal difficulties, saving significant labour time on production lines.
The Verdict	High-speed kiss cutting is the idea choice for high-volume efficiency. If your team rapidly peels and places silicone sponge gaskets onto electrical enclosures, HVAC units, or lighting fixtures, kiss-cut rolls maximise speed and throughput for high-volume runs.

Why Select Waterjet Cutting for Complex or Thick Silicone Gaskets?

Waterjet cutting is often the preferred choice for prototypes, short production runs, complex gasket designs, and thick silicone materials. Because a CNC-guided water stream cuts without physical downward pressure, it prevents soft sponge from crushing and creates clean, perfectly vertical edges without the need for expensive dies.

Using direct-from-CAD processing, waterjet technology completely removes the need for physical tooling. This enables immediate production turnarounds and easy design modifications for low-to-medium volume runs.

	Waterjet Cutting
How It Works	A high-pressure water stream cuts the material directly from a digital CAD file with pinpoint accuracy.
Best For	Prototypes, low-to-medium volume runs, complex/intricate shapes, and exceptionally thick materials.
Material Compatibility	Ideal for both thick solid silicone rubber and soft silicone sponge, delivering clean, smooth vertical edges.
Tooling & Cost Structure	Zero upfront tooling costs and no physical die setup delays, making short runs instantly accessible.
The Verdict	Perfect for rapid prototyping and bespoke production. Because the waterjet exerts no physical downward pressure, it prevents soft silicone sponges from crushing or bowing during the cut, delivering superior dimensional accuracy on complex or thick gaskets.

Choosing the Right Method for Your Silicone Gaskets

To choose the best cutting process, consider these four core criteria: your total production volume, material thickness, gasket design complexity, and required assembly speed. High-volume runs favour die or kiss-cutting, whereas thick materials, intricate shapes, and rapid prototypes are better suited to waterjet cutting.

When evaluating gasket production techniques, review this checklist:

Volume: Waterjet cutting is often a good choice for short runs and prototypes, as it avoids tooling costs. For large-scale, high volume gasket production, opt for die cutting or kiss cutting.

Material Thickness: Waterjet cutting handles thicker materials, whereas die-cutting is better suited to thin to medium gauge sheet or roll material.

Assembly Needs: If your team requires rapid, peel-and-stick assembly, high-speed kiss cutting on a roll is an ideal choice.
Design Complexity: Waterjet cutting offers a high level of precision for intricate, complex gasket profiles that cannot be easily achieved with a steel blade.

Optimise Your Gasket Production with the Right Cutting Technology

Selecting the right conversion process is just as important to your project’s success as choosing the right grade of silicone. Working with CB Frost, you benefit from our extensive material stock, with our in-house toolroom, cutting presses (including our high speed cutting press), and advanced waterjet systems, we help you reduce unit costs, cut out bottlenecks that affect lead times, and ensure flawless seal performance.

Talk to our expert sales team today to discuss your technical drawings and explore the best cutting strategy for your silicone gaskets.

Rolling Stock Networking: Connect with CB Frost at RSN 2026

Posted on June 23, 2026June 23, 2026 by RobSEO

At CB Frost & Co, we don’t believe in waiting around when a great opportunity knocks. That is exactly why we signed on the dotted line to secure our exhibition stand for Rolling Stock Networking (RSN) 2026 soon after last year’s event.

This year’s RSN event takes place at Derby Arena on Thursday, 2nd July.

As a specialist rubber and plastics manufacturer, and preferred converter for Rogers Corporation (a relationship spanning over 30 years), we supply a wide range of high performance EN45545-2 compliant products to meet the most stringent demands of modern rail applications, including Rogers’ world-class BISCO® Silicones and PORON® Urethane materials and Armacell’s ArmaFlex® Closed Cell Insulation Foams.

RSN is always a highlight of our calendar as it’s a prime opportunity to showcase our bespoke solutions and expertise.

What is Rolling Stock Networking?

RSN is the UK’s largest international rail show, focused entirely on the essential details that keep the network moving. The exhibition specifically targets:

Passenger and Freight Rolling Stock
Technical Enhancements and Innovation in the Rail Industry
Depot Equipment and Ancillary Services
The Wider Rail Supply Chain

What makes RSN stand out in a crowded exhibition calendar is its unique philosophy. It’s free to attend and is designed to offer market access to companies of all sizes. Whether you are an OEM or a highly specialised SME like us, the event provides a level playing field to showcase capabilities to the entire rail sector.

Find CB Frost at Stand E2

We were fast to secure our spot at RSN 2026 due to the fantastic atmosphere of collaboration that we have experienced in previous years. Each event provides a great networking platform, with a focus on innovation and achieving shared goals.

You can find us this year at exhibition stand E2.

Here’s what we are looking forward to in Derby this year:

Catching up with clients: We love catching up face-to-face with our long-standing rail clients, finding out what challenges they are facing this year and how we can support their upcoming projects.
Meeting new faces: With buyers and suppliers from across the passenger and freight sectors all under the same roof, it’s the perfect place to spark new partnerships.
Support the next generation of rail professionals: We’re proud to be part of an event that invests heavily in the future of the rail community.

Let’s Collaborate in Derby

As we finalise our stand preparations, our focus remains firmly on how we can add value to your next project. From fire-retardant silicone sponge to bespoke sealing solutions that withstand the toughest rail environments, we’re ready to show you how we keep the industry safe and sealed.

If you’ll be at Derby Arena on the 2nd of July, our team will be at Stand E2 all day, so drop by, say hello and grab a coffee with us. We’re excited to chat and explore how we can support each other to drive growth and technical excellence in the rail industry. See you there.

Why Choosing the Right EN45545 Gasket is Critical for Rail Industry Safety

Posted on June 4, 2026 by RobSEO

In the modern rail industry passenger safety dictates every phase of vehicle design, engineering, and manufacturing. Major structural components, advanced braking mechanisms, and crash-management systems often take the spotlight, but even seemingly minor components within train interiors are absolutely vital for passenger safety during an emergency. One of the most critical, but less talked about elements, in rail interior environments is the EN45545 gasket.

Gaskets are used extensively throughout rail vehicles, from sealing doors and securing windows to isolating HVAC systems, and protecting electrical and lighting enclosures. Whatever the application, it is essential that the right gasket materials are chosen.

Critical safety role: While often overlooked, EN45545 gaskets are vital for passenger safety, securing everything from doors and windows to HVAC and electrical systems.
Rail fire hazards: In enclosed rail environments like tunnels, smoke inhalation and toxic fumes are the primary causes of injury. Non-compliant rubber can act as fuel, accelerating fire and creating blinding smoke that blocks evacuation routes.
EN45545-2 standard: Established in 2013, this regulation unifies fire safety by testing materials for fire, smoke, and toxicity. Materials are categorised by Hazard Levels (HL1 to HL3) based on the operating environment.
Consequences of non-compliance: Using non-compliant materials leads to severe legal penalties, vehicle recalls, and lasting brand damage.
Applications: EN45545 gaskets prevent fire from breaching compartments via doors/windows and stop the spread of toxic smoke through HVAC networks.
Expert manufacturing: CB Frost converts high-performance materials (such as Bisco® silicone foams and LSLT EPDM) into precision components that meet stringent HL3 safety benchmarks.

The Unique Danger of Fire in the Rail Environment

Trains are high capacity, enclosed spaces that frequently travel at high speeds through remote areas, lengthy tunnels, or underground networks. In the event of a fire, immediate evacuation is often physically impossible, and this is why material selection is so critical.

During a rail fire, the flames themselves are not the only danger. Statistics consistently show that smoke inhalation and exposure to toxic fumes are the leading causes of injury and fatality in train fire incidents.

Choosing the wrong rubber gaskets or sealing materials for rail interiors can have catastrophic real-world consequences. Standard, non-rated industrial rubber compounds can act as highly combustible fuel. When exposed to heat or open flame, they can accelerate the spread of the fire and emit thick, lethal, and blinding smoke. This dark smoke quickly obscures emergency lighting and signage, plunging passengers into darkness and severely impeding evacuation routes.

Beyond the threat of fire and smoke spreading, using substandard gasket materials also presents huge compliance and operational problems. Rail manufacturers and suppliers caught using non-compliant parts face heavy legal penalties, costly vehicle recalls, and irreparable damage to their brand reputation.

The EN45545-2 Standard

To combat the specific risks of the rail sector and unify fire safety regulations across European and international railways, the EN45545-2 standard was established in 2013. This safety regulation stringently dictates the fire, smoke and toxicity properties of all materials and components used in railway vehicles.

Under the EN45545-2 directive, materials are rigorously tested and categorised based on their use and the specific Hazard Level (HL1, HL2, or HL3) required for the operating environment of the train. For example, a high-speed sleeper train or a subterranean metro system will require the highest hazard level classification (HL3) due to the extreme difficulty of evacuation.

By selecting fully certified EN45545 gaskets, engineers ensure that the materials will resist ignition, prevent the spread of fire, and drastically limit the release of harmful gases. This critical delay in fire propagation grants passengers and crew the precious minutes needed to evacuate safely.

Key Applications for EN45545 Gaskets

EN45545-2 compliant gaskets are not just used in one specific area; they are integral to the entire anatomy of a train car. Key interior applications include:

HVAC systems: Sealing ducting and conditioning units to prevent the rapid spread of toxic smoke through the train’s ventilation network.
Door and window seals: Providing weather-tight insulation while ensuring fire doesn’t easily breach passenger compartments.
Lighting and electrical enclosures: Preventing localised electrical faults from igniting surrounding panels and materials.
Flooring and panelling: Providing vibration dampening and acoustic insulation between interior panels without adding combustible mass.

How CB Frost Delivers Uncompromising Rail Safety

At CB Frost & Co, we know that there is zero room for error or compromise when engineering components for mass transit. As a preferred converter for Rogers Corporation, we are experts in manufacturing fully compliant gaskets from the highest performance, EN45545 compliant materials available on the market, including specialised silicone and EPDM sponges, foams and solid rubbers.

Compliant Rail Materials (EN45545-2)

Bisco® HT800 medium silicone foam
Bisco® BF1000 soft silicone foam
Bisco® BF2000 ultra soft silicone foam
CBF Sil-V0 silicone sponge
MF1 (55) seating foam
MF775 (FR8775) silicone rubber
LSLT EPDM rubber
LSLT neoprene sponge
Rail SD and SDC Insulation foam
Sustamid (plastic)

Our experienced team works closely with rail operators, OEMs, and rail interior designers to ensure that every seal, gasket, and extrusion meets the exact specifications and hazard levels of the project. We convert these high performance materials, specifically formulated and independently tested to pass stringent regulatory standards, into precision-cut moulded, extruded, or fabricated components.

From high volumes of die-cut gaskets to custom extrusions and waterjet-cut profiles, our advanced manufacturing capabilities guarantee that your rail interiors are equipped with materials that meet the highest possible safety, durability, and performance benchmarks.

Don’t leave passenger safety or EN45545-2 regulatory compliance to chance. Partner with a manufacturer that truly understands the rigorous demands and life saving importance of the modern rail sector.

Learn more about our dedicated manufacturing capabilities for the rail sector and explore our complete range of compliant materials by visiting our rail industry page.

If you are ready to start on your next rail project, talk to our experienced sales team.

Which Rubber Gasket Do You Need? Solid or Sponge?

Posted on May 1, 2026 by RobSEO

When sourcing sealing solutions for your next engineering, manufacturing, or construction project, selecting the right material is critical. Make the wrong choice and you risk leaks, environmental damage, or system failure. For buyers and procurement managers, one of the most common dilemmas when specifying a seal is material selection, and deciding between a solid rubber gasket and a compressible sponge gasket.

CB Frost & Co has over 100 years of experience in converting high-performance sponge and rubber materials for applications in practically all industries. To help you make the right choice for your application, we have broken down the core differences in compressibility, gap-filling properties, and high-pressure sealing capabilities.

Solid vs. Sponge

The main difference between choosing solid rubber or soft sponge gaskets comes down to compressibility and pressure.

Solid rubber gaskets are best for high-pressure sealing between two flat, rigid surfaces. They are highly durable but do not easily compress.

Sponge gaskets are best used for gap filling, cushioning, and low-closure force sealing applications. Their cellular structure allows them to compress easily and conform to uneven or irregular surfaces.

Feature	Solid Rubber Gaskets	Sponge Gaskets
Compressibility	Very low – the material deflects rather than compresses.	High – the cellular structure allows it to squash easily.
Closure Force Required	High – requires significant clamping pressure or heavy metal bolts.	Low – creates an effective seal under minimal compression.
Ideal Mating Surface	Perfectly flat and rigid surfaces.	Uneven, irregular, textured, or misaligned surfaces.
Key Advantages	Highly durable, extreme high-pressure performance, and superior chemical/liquid resistance.	Excellent gap filling, shock absorption, and vibration dampening without damaging delicate enclosures.
Example Applications	Pipe flanges, heavy machinery, high-pressure fluid transfer systems, and heavy automotive components.	HVAC systems, electrical enclosures, lighting fixtures, EV battery compartments, and rail interiors.

Understanding Solid Rubber Gaskets

High pressure sealing

Solid rubber materials are dense, non-porous, and unyielding. As they lack pockets of trapped air within their structure, they have a very low compressibility. This means that a significant closure force is required to create an effective seal with a solid rubber gasket. Once under this pressure, the material deflects rather than compresses, creating an impenetrable seal against liquids, gases, and environmental elements.

Key advantages:

Durability: Highly resistant to wear, tear, and abrasion.

High-pressure performance: A popular choice for heavy duty applications where strong clamping forces are applied.

Chemical and liquid resistance: Superior at blocking chemicals, oils, and high-pressure water, compared with most sponge materials.

With its sealing capabilities, solid rubber is frequently selected for applications such as pipe flanges, heavy machinery, high pressure fluid transfer systems, and heavy automotive components.

Rubber: MF775 Silicone Rubber, HT200 Silicone Rubber, General Purpose Silicone Rubber, Neoprene Rubber, Nitrile Rubber, Commercial Rubber, Commercial Insertion Rubber, EPDM Rubber, LSLT EPDM Rubber.

Understanding Sponge Gasket

Gap filling and cushioning

In contrast to solid rubber, sponge materials are developed with an open or closed-cell structure that contains pockets of air or gas. This gives sponge materials their defining characteristic of high compressibility.

As it compresses easily, there is no need to apply extreme pressure to create a seal. The material naturally squashes down to fill empty spaces, sealing irregular surfaces seamlessly and accommodating different tolerances.

Closed-cell sponges are incredibly effective at keeping out dust, moisture, and air, even under minimal compression.

Key advantages:

Gap filling: Conforms effortlessly to uneven, misaligned or textured surfaces.

Cushioning and vibration dampening: Absorbs shock, rattles and vibrations, making sponge gaskets ideal for enclosure and delicate electronics.

Low closure force: Perfect for applications involving lightweight plastics, thin sheet metals, or even glass, where heavy closing pressure would cause damage.

Ideal sealing and cushioning applications for sponge include HVAC systems, electrical enclosures, lighting fixtures, EV/HEV battery compartments, and passenger rail interiors.

Sponge: CBF Sil V0 Silicone Sponge, General Purpose Silicone Sponge, Neoprene Sponge, LSLT Neoprene Sponge, EPDM Sponge, PVC Sponge, Nitto Semi-Closed Sponge.

Solid Rubber or Sponge? A Buyer’s Checklist

When selecting the right gasket material for your unique needs, we always recommend that you ask yourself the following questions about the application:

What is the clamping force? If your application uses heavy metal bolts, torqued to high pressure, a solid rubber gasket is likely required. If you are using low closures pressure, for example, lightweight hinges or minimal bolting, then opt for a sponge gasket.

Are the mating surfaces perfectly flat? If the surfaces are perfectly flat, then solid rubber is a good choice. However, if the surfaces are uneven or textured, then the cushioning profile of a sponge gasket may be the more suitable choice.

Partner with the UK’s premier Rubber and Plastics Specialists

Whether your project demands the high pressure resilience of solid rubber gasketing, or the reliable cushioning capabilities of sponge, CB Frost & Co can deliver the right solution. As preferred converters for global brands like Rogers Corporation and Armacell, we have the facilities and expertise to provide tailored, high quality seals and components for the Rail, Automotive, HVAC and Defence industries, as well as practically all other industrial sectors.

Need help specifying the right material for your next gasket production run? Contact the expert team at CB Frost & Co today to discuss your requirements, request a data sheet, or get a quote.

What Makes BISCO® HT800 the Industry Standard for Silicone Sponge?

Posted on April 14, 2026 by RobSEO

Sealing and protecting infrastructure like outdoor electrical enclosures, industrial lighting and HVAC units is a key consideration for engineers and manufacturers. In environments where there is a constant battle against the elements, a seal failure doesn’t just mean a bit of water ingress, but can lead to huge system failures that generate major safety hazards, downtime, and high repair costs. For such critical sealing applications, BISCO® HT800 is an increasingly popular choice of silicone sponge.

At CB Frost, as a preferred converter of Rogers Corporation, we supply and convert vast quantities of Rogers’ full range of BISCO® cellular silicones. HT800 silicone foam is increasingly viewed as the industry standard, and we believe the reasons for its popularity come down to three core facets:

Enduring physical memory (compression set)
Relentless environmental resistance
Lasting assembly line efficiency

HT800 – Memory and Durability

The real test of any sealing material isn’t how it performs on day one, but how it performs on day one hundred or day one thousand.

Many elastomers have a high compression set. This means that when compressed between two surfaces, they require a high closure force to effectively seal, and when compressed for extended periods they can permanently deform. For example, when a seal or gasket fails to bounce back to its original shape, it leaves a gap where water, dust and other contaminants can enter.

HT800 is engineered to have exceptional compression set resistance. It has an excellent cellular memory, which means it continuously pushes back against the surfaces it is sandwiched between, ensuring a tight and reliable seal even after years of sustained compression.

If your application involves panels, doors or housings that will be repeatedly opened and closed over their lifespan, then a HT800 silicone foam gasket ensures that seals won’t need to be replaced at every maintenance check.

UV and Ozone Resistance

Silicone sealing materials for outdoor applications are subjected to sometimes brutal environmental conditions. Many traditional rubbers become brittle or ultimately disintegrate when exposed to UV light and ozone for prolonged periods, but HT800 is formulated to be highly resistant to both, making it an ideal choice for applications such as:

Outdoor enclosures: HT800 protects sensitive electrical and telecommunications components from wind-driven rain and environmental contaminants.

HVAC units: It handles the thermal cycling and outdoor exposure in large heating and ventilation systems without degrading.

Industrial lighting: It withstands extreme temperature fluctuations, along with the environmental exposure experienced in outdoor lighting systems.

EN45545 Compliance

In modern manufacturing, particularly in production for the rail, mass transit and aerospace sectors, fire safety is a non-negotiable. HT800 silicone foam is not just a physical barrier against the weather, but a critical safety component. It is compliant with the stringent EN45545-2 standard for fire safety in railway vehicles. Whilst this standard is specifically for compliance within the rail industry, it gives design engineers in all sectors peace of mind when it comes to fire safety, and simplifies the safety auditing process.

The Benefits of Adhesive-Backed HT800 Foam Conversion

When it comes to assembly line efficiency, messy liquid adhesives or struggles with aligning rubber, foam or sponge gaskets can affect production costs. In addition to the versatile resistance qualities of HT800, it is also just as versatile when it comes to conversion. It can be supplied with adhesive backing and cut into strips, or intricately die-cut gaskets on a roll, contributing to a streamlined assembly process.

Peel-and-stick: Adhesive-backed HT800 strips or gaskets can be quickly pressed into place to create an effective seal.

Consistency: Pre-cut strips with a consistent thickness and width ensure consistency of sealing footprint.

Upgrading Your Sealing Strategy

If you are designing new outdoor enclosures or looking to increase efficiency on HVAC production lines, BISCO® HT800 is the industry standard for silicone sponge or foam, providing the perfect balance of long-term durability, practical application, and fire safety compliance.

For assistance with material selection for your next project, or for gasket or strip production with fast-lead times and the highest performing cellular silicone materials, talk to us today. Our experienced sales team is here to help you find the precise grade, thickness and manufacturing processes for your application.

Navigating EN45545-2: Why Silicone is the Gold Standard for Rail Interiors

Posted on March 11, 2026March 24, 2026 by RobSEO

The CB Frost Guide to Hazard Levels, Fire Safety, and Material Selection for the Rail Industry.

Passenger safety is at the centre of every design decision for the modern rail industry. Since the mandatory adoption of EN45545-2 (the European standard for fire protection on rail vehicles) across Europe in 2016, gasket materials designed for the mass transit sector are a necessity.

For engineers designing interior applications for rolling stock, including HVAC systems, lighting enclosures, and doors seals, the challenge is finding a material with the necessary balance of mechanical durability and the strictest fire, smoke and toxicity standards required by EN45545-2. With this balance considered, high-performance grades of Silicone rubber, sponge and foam are the clear winner.

To ensure you are selecting the best suited materials for various sealing and cushioning applications within rail interiors, this guide explores why Silicone materials, including the Rogers BISCO® family and MF775 Silicone rubber, are outperforming other gasket materials when it comes to rail industry compliance.

Understanding EN45545-2 Hazard Levels

To select the right rail material for your application, it’s important to understand the classification system. EN45545-2 classifies rail vehicles based on the environment they operate in and the difficulty of evacuation, categorised into Hazard Levels.

HL1 & HL2: Hazard Levels 1 and 2 typically apply to standard operation rail vehicles, such as trams or subways, where evacuation is generally straightforward.

HL3: This is the strictest category, required for vehicles that operate in tunnels, or environments where evacuation is much more difficult.

The most important thing to remember is that compliance is mandatory. If your interior gasket material fails to meet the relevant EN45545-2 Hazard level for its use, then the entire rail carriage can fail compliance. At CB Frost, we supply Silicone grades specifically formulated to meet these rigorous HL3 requirements.

Silicone Rubber, Sponge and Foam for Rail Applications

The table below features our top Silicone rubber, sponge and foam grades commonly used for rail interiors, outlining their application suitability and compliance.

Material Grade	Type	Common Applications	Compliance
Rogers BISCO® HT800	Silicone Foam (Medium)	HVAC Seals, Enclosures, General Sealing	EN45545-2 (HL3), UL94 V-0, HF1
Rogers BISCO® BF1000	Silicone Foam (Extra Soft)	Low-Closure Force Door Seals, Gap Filling	EN45545-2 (HL3), BS 6853, UL94 V-0, HF1
Rogers BISCO® BF2000	Silicone Foam (Ultra Soft)	Vibration Isolation, LCD Gaskets	EN45545-2 (HL3), BS 6853, UL94 V-0, HF1
MF775 Solid Silicone	Solid Rubber (60 Shore)	External Gaskets, Heavy-Duty Seals	EN45545-2 (HL3), LUL S1085
MF1 Silicone	Silicone Foam	Seating Cushions, Gap Fillers	EN45545-2 (HL3)
CBF Sil-V0	Silicone Sponge	LCD Gaskets, HVAC Seals, Door & Window Seals	EN45545-2 (HL3), UL94 V-0

Silicone or EPDM for Rail?

Since the introduction of EN45545-2, one of the most common questions we have been asked by Engineers designing new rail vehicles is whether they can use EPDM for its lower cost and weather resistance. Low Smoke Low Toxicity (LSLT) grades of EPDM are EN45545-2 (HL3) compliant and are well suited to some rail applications. However, Silicone rubbers are frequently preferred due to these three distinct advantages:

Fire resistance: Silicone naturally self-extinguishes and does not release the toxic smoke associated with standard grades of EPDM or Neoprene. LSLT grades of EPDM are engineered specifically to prevent the release of toxic smoke.
Temperature range: Silicone materials for the rail industry function effectively from -55°C to +200°C (and -60°C to +230°C for CBF Sil-V0), ensuring seals do not crack in freezing conditions or melt or deform in high temperatures.
Compression set resistance: Materials like HT800 have excellent “memory”, which means they return to their original shape even after years of compression. This characteristic is essential for preventing rattling doors and drafty windows that can be an issue for aging rail carriages.

Common Rail Applications

Silicon rubber, foam and sponge materials are frequently used for rail applications including:

Don’t Gamble with Rail Industry Compliance

When it comes to mass transit, you can’t gamble with compliance. The cost of a failed safety audit, or worse, a safety incident, far outweighs the cost difference between generic rubber and high performance Silicone engineered for the rail industry.

As a preferred converter of Rogers BISCO® materials for over 30 years, we have the materials and expertise to manufacture bespoke gaskets and seals through processes including cutting, extruding, moulding and fabrication.

Need help selecting the right grade of Silicone for your next rail project? Speak to our team today or browse our rubber, sponge and foam materials.

Extending Railcar Life: How Smart Material Upgrades May Improve Safety, Comfort, Longevity and Compliance

Posted on February 23, 2026 by RobSEO

A refurbishment project often begins with a walkthrough of a decades-old train. The seats may have lost their comfort, or the door seals no longer close tightly. Panels rattle under vibration, and the materials behind them were never designed for today’s safety concerns.

Yet the frame is solid, and the operator’s goal is clear: extend service life while improving performance and compliance.

For design engineers, that means upgrading the materials inside these railcars to meet European modern standards like EN45545-2 without changing the structure or layout of the vehicle. It requires components that fit existing geometries, withstand years of service, and pass the tests that matter: flame spread, smoke density, and toxic gas emissions.

That is where CB Frost comes in. We combine globally trusted materials from Rogers Corporation with local engineering and fabrication expertise to help European refurbishment teams modernise existing fleets efficiently and confidently.

EN45545-2: Modern Standards for Legacy Fleets

EN45545-2 defines how materials must perform in the event of a fire. It categorizes applications by hazard levels (HL 1, HL 2, HL 3) and requirement sets (R 1–R 26) that apply to specific components such as interior panels, seating, and electrical insulation. Materials that achieve HL 3 performance automatically comply with HL 1 and HL 2, giving engineers flexibility and confidence across designs.

Rogers Corporation BISCO® silicones—including HT-800, BF-1000, and MF1®—are tested and approved to EN45545-2 with materials meeting several Requirement Sets R2, R3, R8, R9, R10, R19, R21, R22 and R23 at Hazard Level 3 (HL 3). These materials are trusted across Europe for seating, interior and exterior sealing, and insulation in refurbishment programs where compliance and long-term reliability are non-negotiable.

Technical Snapshot: BISCO® MF1® Silicone Foam

Typical Applications: Seating, interior panels, cushioning, vibration isolation
Standard: EN 45545-2 R19 and R21 (HL3 compliant for seating applications)
Density: 80 – 112 kg/m³ (depending on grade MF1-35 to MF1-75)
Compression Set: ≤ 1.5 % (ASTM D 1056, 22 h at 70 °C)
Temperature Range: −55 °C to +200 °C
Features: Excellent resilience, low smoke and toxicity, durable comfort over years of use

Designing for Long-Term Performance

Material selection determines how long an upgrade truly lasts. In older trains, foam cushions and rubber seals often degrade from heat, compression, and vibration. Over time, they lose recovery, allowing gaps to form or comfort to diminish.

Upgrading to engineered silicone foams solves these issues by maintaining flexibility, compression recovery, and stability even after years of continuous loading and temperature cycling.

BISCO MF1 maintains comfort and resilience in seat cushioning and interior panels while meeting the strictest fire-safety standards
BISCO® HT-800 offers stable compression and sealing for doors, roof mounts, and HVAC systems, helping prevent water ingress and noise transfer.
BISCO® BF-1000 provides a lightweight, flame-retardant option for enclosures and insulation applications.

These materials perform across wide temperature ranges and resist environmental aging, helping operators extend maintenance intervals and lower total lifecycle cost.

Local Fabrication, Faster Turnaround

Refurbishment projects often run on tight schedules. Every additional week a train remains in the depot adds cost and disrupts operations. CB Frost supports these programs with UK-based converting and lamination capabilities, turning certified materials into ready-to-install parts within short lead times.

Our in-house team can reproduce existing parts, modify designs for fit, or laminate pressure-sensitive adhesives for easier assembly. Local stock of EN45545-2 compliant materials ensures that supply keeps pace with refurbishment timelines.

Global Materials. Local Expertise.

The Rogers and CB Frost & Co partnership gives European rail engineers the best of both worlds: Globally proven materials from Rogers —trusted by major OEMs and Tier 1 suppliers—and CB Frost’s local, responsive support to help implement them effectively.

Together, we simplify refurbishment programs, reduce lead times, and ensure that every component meets the highest standards for safety and reliability.

Extending railcar life is not only a matter of maintenance; it is an opportunity to upgrade performance and safety. Replacing outdated foams and seals with high-performance silicones helps fleets meet today’s standards while preparing for another decade of reliable service.

From seat cushions to HVAC seals, our material solutions are engineered for performance, fabricated locally, and built to last.

To discuss your rail needs or for assistance in material selection, talk to our knowledgeable sales team.

Silicone Rubber vs. EPDM: Which is best for High Temperature Sealing?

Posted on February 2, 2026February 2, 2026 by RobSEO

Selecting the ideal material for industrial sealing solutions comes down to the specific environmental conditions that the seal will be exposed to. Two of the most popular contenders for sealing solutions in a wide variety of industries are General Purpose Silicone Rubber and EPDM Rubber. Both are high-performance materials offering distinct advantages, particularly for use in outdoor applications where resistance to weather and elements like ozone and UV are key. However, when the application heats up, the differences in characteristics between these two materials become all the more important.

For engineers or procurement specialists making decisions on gasketing and sealing materials, when it comes to choosing between Silicone and EPDM, understanding their specific thermal resistance capabilities is vital for preventing seal failure.

Let’s take a deep dive into the key specifications of Silicone Rubber and EPDM Rubber, to determine which is the better choice for high temperature sealing applications.

EPDM Rubber: Key Specifications

EPDM (Ethylene Propylene Diene Monomer) Rubber is often chosen for its impressive weathering capabilities, particularly in the automotive and construction industries, for applications such as window seals, roofing membranes, and a wide range of outdoor gaskets.

Standard EPDM is designed for moderate temperatures, operates effectively within a wide temperature range of -30°C to +80°C, whilst specialist grades can push the upper temperature limit, for example, LSLT EPDM (Low Smoke Low Toxicity) operates within -30°C to +100°C.

Strengths

Despite moderate temperature limitations compared to some other elastomers, EPDM exhibits strong characteristics that make it a strong choice for many applications:

Weathering: It offers outstanding resistance to ozone, UV light, and general weather conditions (including rain and frost).
Chemical resistance: EPDM shows good resistance to water-based chemicals and vegetable-based hydraulic oils, making it ideal for automotive braking systems and water handling.
Durability: It is known for good tensile strength and a low compression set, meaning it recovers well after being compressed.

Whilst EPDM is a durable and weather resistant material, for applications involving an environment where temperatures can exceed +80°C (or +100°C for LSLT), it begins to degrade, leading to seal failure.

Silicone Rubber: Key Specifications

General Purpose Silicone Rubber is a popular choice for a range of extreme environments. It’s an inert material, meaning it doesn’t react with most chemicals, and as a result is widely used in industries ranging from food and drink processing to mass transit and aerospace.

The thermal resistance of Silicone is often a key consideration for engineers, as it is capable of operating under extreme temperatures between -60°C and +230°C, whilst specialised grades such as HT200 can withstand temperatures of up to +250°C, whilst maintaining structural integrity.

Strengths

The most notable strengths of General Purpose Silicone include:

Extreme heat performance: With a standard upper limit of +230°C, silicone can survive in environments that would melt or significantly degrade EPDM.
Inertness and safety: Most grades of solid silicone are food safety compliant and WRAS (Water Regulations Approval Scheme) approved, making them safe for food, drink, and potable water contact.
Longevity: General Purpose Silicone has a long life span, and maintains excellent resistance to ozone and UV, much like EPDM.

Making the Right Choice

For applications involving sealing engine compartments, industrial ovens, or steam processing lines, EPDM Rubber is most likely insufficient due to the limitations of the material’s temperature resistance. However, EPDM is well suited to applications where weather resistance is essential, but heat is more moderate.

In contrast, Silicone performs strongly when exposed to heat, whether General Purpose or a specialised grade. At over +200°C, Silicone remains flexible and maintains its sealing ability, whereas EPDM would fail under the same conditions.

While Silicone certainly wins on temperature, when cost and specific chemical compatibility are also factors, EPDM can be a cost-effective choice and has strong resistance to certain oils that may damage Silicone. However, for applications where the primary threat to sealing ability is heat, Silicone Rubber is the go to choice.

Your Next Project

If you are considering the right gasket or sealing material for your next project, talk to CB Frost & Co. Our experienced sales team will be able to help you choose the best suited and most cost-effective material specifications for your intended application.

The Spirit of Giving: Making a Difference in Birmingham and Beyond

Posted on December 18, 2025 by RobSEO

As the festive lights brighten the streets of Birmingham, and we prepare to shut down for Christmas, we find ourselves reflecting on more than just our production targets and latest projects. At CB Frost & Co, this time of year is always a time to pause and consider our role within the community that has supported us for generations.

Christmas is certainly a time for celebration, but it also serves as a reminder that many people, families, animals, and the organisations that support them face significant challenges. We strongly believe that a business is only as strong as the community it calls home, so we have chosen to make donations towards making a tangible difference.

Our 2025 Christmas giving initiative is centred around our core values of respect, putting people first, and giving a contribution back to society. This year, we’re proud to shine a spotlight on four remarkable causes. From supporting those in need here in Birmingham, to supporting specialised medical research and animal welfare, these charities represent the best of the human spirit.

Learn more about the organisations we are donating to this year, and the vital work they do.

Birmingham Crisis Centre

For many, the Christmas holidays are a time of family and security, but for victims of domestic abuse, it can be the most dangerous time of the year. Birmingham Crisis Centre provides a safe haven for women and their children who are victims of domestic abuse.

Beyond providing emergency accommodation, Birmingham Crisis Centre also provides 24-hour helpline support and an on-site nursery to help children process trauma in a safe, stable environment. Their work doesn’t just offer an escape, they empower women to rebuild their lives with dignity.

SIFA Fireside

With temperatures dropping, the work of SIFA Fireside to tackle homelessness in Birmingham becomes even more vital. Based in our old home of Digbeth, they are the central hub for Birmingham’s homeless and vulnerably housed adults.

SIFA Fireside’s impact goes beyond providing hot meals and showers, they look at the individual. By supporting them, we are supporting their mission to provide a pathway out of homelessness through medical care, mental health support, employment workshops and legal advice.

The Big Shave: Raising Awareness for Loeys-Dietz Syndrome

We are supporting The Big Shave, a personal fundraising drive aimed at researching and raising awareness of Loeys-Dietz Syndrome (LDS), a rare genetic disorder discovered in 2006 that affects the connective tissues in the body, which can lead to life-threatening heart and blood vessel complications.

Funds for this cause go towards aortic research towards improving early detection, monitoring and treatment of people with LDS, and targeted awareness for medical professionals to recognise the early signs.

As a rare and little known disorder, we feel it is all the more important to support this cause to raise much needed funds and awareness.

Goodheart Animal Sanctuaries

Located just outside Birmingham on the Worcestershire border, Goodheart Animal Sanctuaries provides a lifelong home for rescued farm animals who have been neglected, mistreated or discarded. Home to over 300 residents, Goodheart provides hands-on rescue services, as well as an award winning education programme aimed at teaching the public about animal welfare.

Our donation goes towards funding Goodheart’s approach of rescue, education and advocacy, values that align with our belief that kindness should extend to all living creatures.

Thank You

While our ethos of “Quality Without Compromise” frequently refers to the gaskets, seals, and bespoke manufacturing solutions that are our speciality, the same standard must also apply to how we conduct ourselves as members of the wider Birmingham business community. We are proud to have grown alongside our city, and take pride in being measured not just by the products that leave our doors, but the positive impact we make.

None of what we do would be possible without our dedicated staff and loyal customers, so we would like to extend a note of thanks for the support we have received in 2025, which has in turn allowed us to extend support to others.

We wish our staff, customers, and the incredible teams at our chosen charities a very happy and peaceful Christmas.

Christmas Shutdown

Please note, CB Frost and Co will be closing for Christmas on Tuesday 23rd December, and we re-open for business as usual on Monday 5th January 2026.

Quality Without Compromise: What Our Customers Are Saying About CB Frost & Co

Posted on December 11, 2025 by RobSEO

At CB Frost & Co, “Quality without compromise” is more than just a catchy tagline—it’s the ethos that has driven our business for over 100 years. A lot has changed since our beginnings in 1921, but our drive to provide the best for our customers has not. Whether we are manufacturing intricate gaskets for the rail or defence industry, or supplying sponge sheeting for construction projects, our primary focus remains the same: ensuring our customers receive the very best service, technical support, and product quality.

As part of our commitment to continuous improvement, we send out an annual Customer Satisfaction Survey. This isn’t just a box-ticking exercise; it’s a vital tool that helps us understand how we are performing, where we excel, and how we can continue to support your business needs.

We were delighted to receive such a high volume of responses this year. The feedback confirms that our dedication to technical excellence and customer care is making a real difference to customer operations.

Reliability When It Matters Most

In the fast-paced industries we serve, we know that lead times and responsiveness are critical. A recurring theme in this year’s survey was our ability to handle urgent requirements without sacrificing professionalism.

One customer noted:

“All my dealings have been met with professionalism and all deliveries, urgent requirements have always been treated with a priority. Excellent, keep up the good work.”

Another added:

“Friendly and quick response to enquiries. Keep up the good work.”

Technical Expertise You Can Trust

We pride ourselves on being more than just a supplier; we aim to be a technical partner. Our sales and technical teams work hard to assist engineers with material selection and complex queries. It was fantastic to see this technical support highlighted in these customer comments:

“Communication is really good from CB Frost, technical knowledge and support is great.”

“We get a very good service, technical understanding etc. Our preferred supplier of gasket materials.”

“CB Frost are a company I have no issues with using or recommending. They have been very helpful when our Engineers have had queries as well.”

Building Long-Term Partnerships

Perhaps the most rewarding feedback comes from those who have worked with us for decades. Building lasting relationships is at the heart of what we do, and we are proud to support you year after year.

“Great company to deal with over many years – Always helpful and supportive.”

“Have been really helpful.”

Looking Ahead to 2026

We would like to say a huge thank you to everyone who took the time to complete the survey. Your feedback is invaluable. It motivates our team to maintain these high standards and ensures we remain your preferred partner for rubber, sponge, and foam materials, and specialist products.

If you have a new project or a complex material requirement, our team is ready to help. Contact us today to discuss your specific needs.

Navigate to our products to learn more about our manufacturing capabilities, or for a range of standard sheet and strip materials, visit our online shop.

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