Silicone Foam Rubber

Silicone Foam Rubber Sheet for Gaskets, Sealing and Insulation

Topsun silicone foam rubber sheet is a soft, compressible closed-cell silicone material for industrial sealing, gasketing, cushioning, thermal insulation, electrical insulation and vibration-control applications.

The current silicone foam range is available in thicknesses from 1.5 mm to 30 mm and multiple densities from 0.14 to 0.55 g/cm³. Different grades provide different compression-force, tensile, dielectric and thermal properties, allowing buyers to select the material according to gasket closing force, sealing pressure, operating temperature and finished-part requirements.

Silicone foam can be supplied as sheets, rolls, strips, pads, gaskets, seals and custom die-cut parts. Topsun also provides cutting, slicing, die cutting, laser cutting, lamination and pressure-sensitive adhesive backing according to customer drawings, samples or application requirements.

Silicone Foam Rubber Product Information

Key Features of Silicone Foam Rubber

• Wide temperature capability: suitable for demanding sealing and insulation environments from approximately -60°C to 200°C depending on grade and operating conditions.

• Multiple compression-force options: different densities provide different levels of softness, closing force and mechanical support.

• Low compression set: the listed grades show ≤5.0% compression set, supporting applications requiring recovery after compression.

• Closed-cell construction: suitable for many gasket and sealing applications where resistance to liquid or gas passage is required when the material is correctly compressed.

• Weathering resistance: silicone materials provide good resistance to UV, ozone and outdoor exposure.

• Thermal insulation: the current grades list thermal conductivity values from approximately 0.05 to 0.10 W/(m·K).

• Electrical insulation: listed grades provide dielectric strength from ≥2.0 to ≥4.0 kV/mm and high volume resistivity.

• Flame-resistant grade options: the current technical data lists V-0 performance for the silicone foam grades shown below.

• Custom converting: silicone foam can be manufactured into gaskets, pads, strips, washers, seals and installation-ready adhesive-backed parts.

Silicone Foam Rubber Sheet Specifications

The following values are typical performance parameters for the current Topsun foamed silicone grades. Final values can vary according to density, thickness, formulation, color, production tolerance and test method. Confirm the required grade and test requirement before production orders.

The V-0 values above reproduce the current listed material data. If your project requires a specific flame-test standard or certification, confirm the test method, material grade, sample thickness and required documentation before ordering.

How to Select Silicone Foam by Compression Force

Compression Force Deflection is one of the most useful parameters when selecting silicone foam for a gasket. It indicates how much pressure is required to compress the foam by a defined percentage.

A softer grade can conform to uneven surfaces using lower closing force, while a firmer grade can provide greater resistance and mechanical support. The correct choice depends on the gasket gap, required compression percentage, fastening system and the stiffness of the surrounding structure.

Density and compression force should not be considered independently. Finished gasket performance also depends on thickness, compression ratio, flange stiffness, fastener spacing, surface condition and service temperature.

What Is Silicone Foam Rubber?

Silicone foam rubber is a lightweight cellular silicone material. Compared with solid silicone rubber, cellular silicone is softer and more compressible, allowing a gasket to conform to gaps and uneven mating surfaces using lower closing force.

The Topsun silicone material described on this page uses a closed-cell structure and smooth outer surface. This makes it suitable for many enclosure, cabinet and equipment sealing applications where a compressible environmental gasket is required.

Silicone also provides useful resistance to heat, cold, UV, ozone and weather exposure, making the foam suitable for both indoor and selected outdoor industrial applications.

Silicone Foam vs. Solid Silicone Rubber

Silicone Foam for Enclosure Gaskets and Cabinet Seals

Industrial electrical enclosures, cabinets, control panels and equipment housings often require a compressible gasket between the cover and flange.

Silicone foam can conform to dimensional variation while providing relatively low closing force compared with harder rubber materials. The correct grade should be selected according to gasket width, thickness, compression percentage, fastener spacing and available closure force.

Where a defined enclosure protection level or specific gasket standard is required, the finished gasket and enclosure assembly should be evaluated against that requirement.

Silicone Foam for Battery Packs and Electrical Equipment

Silicone foam can be converted into perimeter gaskets, cushioning pads, insulation pads and other suitable components for battery enclosures and electrical equipment.

The current material range provides both electrical insulation and compression properties. The listed grades have volume resistivity of ≥1.0×10¹⁴ Ω·cm and dielectric strength values from ≥2.0 to ≥4.0 kV/mm depending on density.

Battery and electrical applications should be selected according to the complete assembly, including voltage, insulation distance, compression force, operating temperature, flame requirements and environmental conditions.

Silicone Foam for Thermal Insulation

Topsun silicone foam grades list thermal conductivity values from approximately 0.05 to 0.10 W/(m·K), depending on material density.

This allows silicone foam to be evaluated for flexible insulation pads, thermal barriers, equipment seals and other applications requiring both compressibility and temperature stability.

Actual thermal performance depends on material thickness, density, compression, surrounding materials, temperature difference and the complete assembly design.

Applications of Silicone Foam Rubber Sheet

Automotive and Mass Transit

Silicone foam can be converted into gaskets, seals, anti-rattle pads, cushioning parts and thermal insulation pads for automotive, bus and rail applications.

Aircraft and Aerospace

Low-density silicone foam can provide lightweight cushioning, insulation and gasketing. Aerospace projects should specify the applicable material, flame and environmental requirements before material selection.

Marine and Thermal Insulation

Silicone foam can be evaluated for suitable marine gasketing, equipment insulation, thermal barriers and protective pads. Projects requiring a specific fire or marine standard should specify the required test method and certification.

Electronics and Electrical Cabinets

Applications include enclosure gaskets, cabinet seals, LED lighting seals, insulation pads and cushioning components where compression and electrical properties are required.

Battery Pack Components

Silicone foam can be converted into suitable enclosure seals, cushioning pads and insulating components according to the battery pack design and project requirements.

Industrial Gaskets and Seals

Silicone foam can be die cut into gaskets, washers, strips, pads, spacers and other custom components for industrial machinery and equipment.

HVAC and Lighting

Suitable applications include HVAC sealing strips, insulation pads and lighting-enclosure gaskets where temperature stability and compression recovery are required.

Custom Silicone Foam Gaskets and Die-Cut Parts

Topsun can convert silicone foam sheet into finished gaskets and components according to customer drawings, CAD files or physical samples.

Adhesive-Backed Silicone Foam

Pressure-sensitive adhesive backing can be applied to suitable silicone foam gaskets, strips and pads to help position the component during installation.

Adhesive selection is important because bonding to silicone surfaces can require a different adhesive construction from bonding to metal, plastic or painted surfaces.

Please provide the bonding substrate, service temperature, humidity conditions and expected service environment when requesting an adhesive-backed silicone foam part.

Custom Silicone Foam Processing Capabilities

Cutting and Slicing

Silicone foam sheets can be cut to the requested length and width or processed to suitable thickness requirements within the applicable production tolerance.

Die Cutting and Gasket Conversion

Custom dies can produce repeatable silicone foam gaskets, seals, washers, strips and pads according to customer drawings.

Laser Cutting and CNC Processing

Digital processing can be evaluated for suitable prototypes and complex foam shapes where dedicated die tooling is not required.

Lamination and Adhesive Backing

Silicone foam can be laminated with suitable films, fabrics or pressure-sensitive adhesive constructions for installation-ready sealing and insulation components.

Compression Molding

Three-dimensional molded foam and foam-composite components can be evaluated for suitable projects requiring defined geometry or custom component construction.

Information to Provide for Silicone Foam Selection

• Application and component function

• Required thickness

• Density if already specified

• Required compression force or softness

• Available gasket gap

• Target compression percentage

• Minimum and maximum service temperature

• Required sealing conditions

• Flame-resistance test or certification requirement

• Electrical insulation requirement if applicable

• UV, ozone, moisture or outdoor exposure

• Adhesive backing requirement

• Bonding substrate for adhesive-backed parts

• Drawing, CAD file or physical sample

• Estimated order quantity

Why Choose Topsun Silicone Foam Rubber?

Topsun supplies silicone foam together with EVA foam, PE foam, XPE foam, IXPE foam, CR foam, EPDM foam, neoprene foam, SBR foam, NBR foam and microcellular soft PVC foam in sheet, roll and custom converted forms.

• Multiple silicone foam densities and compression-force levels.

• Thicknesses from 1.5 mm to 30 mm.

• Custom sheet, roll, strip, pad and gasket production.

• Die-cut and adhesive-backed finished parts.

• Material selection according to compression, temperature and sealing requirements.

• Custom conversion according to drawings and physical samples.

Our facility is located in Changzhou City, Jiangsu Province, China, with convenient access to Shanghai Port for international shipments.

Silicone Foam Rubber FAQ

What is silicone foam rubber?

Silicone foam rubber is a cellular silicone material used for sealing, gasketing, insulation, cushioning and vibration control. It is softer and more compressible than solid silicone rubber while retaining useful silicone properties such as temperature and weather resistance.

Is silicone foam the same as silicone sponge?

The terms are sometimes used differently by material manufacturers. Buyers should therefore compare the actual cell structure, density, compression force, thickness and test data rather than selecting material only by the product name.

Is the Topsun silicone foam on this page closed cell?

Yes. The silicone foam described on this page has a closed-cell structure and smooth outer surface for suitable sealing, gasketing and insulation applications.

What thicknesses are available?

The current product range lists thicknesses from 1.5 mm to 30 mm. Confirm the required thickness, tolerance and grade when requesting a quotation.

What density range is available?

The current performance table includes silicone foam densities from 0.14±0.04 to 0.55±0.04 g/cm³.

What temperature can silicone foam rubber withstand?

The silicone foam described on this page is suitable for approximately -60°C to 200°C depending on grade and application conditions. Long-term performance also depends on compression, exposure time and the service environment.

What is Compression Force Deflection?

Compression Force Deflection measures the pressure required to compress foam by a defined percentage. It helps engineers compare how soft or firm different silicone foam grades are and estimate the closing force required by a gasket.

Why is compression set important for a silicone foam gasket?

Compression set indicates permanent thickness loss after the material has been compressed under defined test conditions. Lower permanent set can help a gasket maintain recovery and sealing pressure during repeated or long-term compression.

Is Topsun silicone foam flame resistant?

The current technical table lists V-0 flame resistance for the shown grades. If your project requires a specific flame-test standard or certification, provide the applicable standard and required thickness so the material can be evaluated correctly.

Is silicone foam electrically insulating?

The current material table lists dielectric strength from ≥2.0 to ≥4.0 kV/mm and volume resistivity of ≥1.0×10¹⁴ Ω·cm depending on density. Final electrical suitability should be evaluated using the complete component design.

What is the thermal conductivity of the silicone foam?

The listed grades have thermal conductivity values from approximately 0.05±0.01 to 0.10±0.01 W/(m·K), depending on density.

Can silicone foam be used for outdoor enclosure gaskets?

Silicone materials provide useful resistance to UV, ozone and weathering and can be evaluated for suitable outdoor sealing applications. The finished enclosure should be tested against the required environmental protection level.

Can silicone foam be used for battery pack gaskets?

Suitable silicone foam grades can be evaluated for battery enclosure gaskets, cushioning pads and insulation parts. Material selection should consider compression force, temperature, electrical and flame requirements of the complete battery system.

Can silicone foam be die cut into custom gaskets?

Yes. Topsun can convert silicone foam into custom gaskets, washers, strips, pads and seals according to drawings, CAD files or physical samples.

Can silicone foam be supplied with adhesive backing?

Yes. Pressure-sensitive adhesive and release liner can be applied to suitable silicone foam parts. Adhesive selection should consider both the silicone surface and the material to which the gasket will be bonded.

How do I choose the correct silicone foam density?

Select density together with compression-force requirements, thickness, gasket gap, compression percentage, closing force, operating temperature and mechanical support requirements. Density alone does not determine finished gasket performance.

What information should I provide for a quotation?

Please provide the application, required thickness, density if known, dimensions, compression requirement, working temperature, sealing requirement, flame or electrical requirement, adhesive requirement, drawing or sample and estimated quantity.

How can I request a silicone foam sample?

Send your requirements to july@topsunfoam.com, including thickness, density, dimensions, application, compression requirement, adhesive requirement and estimated quantity for evaluation.