Cellular rubber seals

Cellular rubber gasket

Cellular rubber gaskets are sealing materials with a closed-cell structure. This structure ensures uniform compression under contact pressure and supports a surface seal against dust, air and moisture.

Typical properties include low water absorption, good elasticity and insulating effects against heat and sound. For applications where a material-based foundation or cut-to-size variants are required, cellular rubber sheets are also suitable as a starting material.

Cellular rubber gaskets are used, among other things, in the automotive industry, in mechanical engineering, in construction and in electronics, for example for housing seals, covers and technical cladding.

Properties

Material base

Cellular rubber for gaskets is based on EPDM, NBR or CR (chloroprene), depending on the requirement. The choice of material depends on the medium, temperature range and ambient conditions. For material classification, EPDM rubber sheets and NBR rubber sheets are suitable as a comparison of the base materials.

Closed-cell structure

The closed-cell structure supports a dense surface and ensures uniform compression under contact pressure. As a result, cellular rubber is suitable for surface seals in housings, covers and technical cladding.

Density and compression behaviour

Cellular rubber gaskets are available in different densities and compression hardnesses. Soft grades adapt more strongly to uneven surfaces, while firmer grades provide higher restoring forces for the same installation travel. Selection is based on gap dimension, contact pressure and the required sealing line.

Temperature range

The service temperature range depends on the respective elastomer. In practice, cellular rubber gaskets are frequently used for applications from approx. -40 °C to +100 °C, depending on formulation and application.

Resistance to media and environmental influences

Resistance to chemicals, oils, greases and weathering is material-dependent. EPDM is typically chosen for weathering, ozone and water environments, NBR for oil-based media, CR for robust applications with good ageing stability.

Advantages

High sealing effect at low contact force

Thanks to the closed-cell structure, cellular rubber gaskets achieve a uniform seal even at low compression. This makes them suitable for designs with limited contact pressure or sensitive mating surfaces.

Low water absorption

The cellular structure limits the penetration of moisture. The sealing function remains stable even in damp environments, for example in indoor and outdoor housings or in technical systems.

Good ageing and weathering resistance

Depending on the elastomer used, cellular rubber gaskets retain their elastic properties over long periods. This supports constant sealing lines under changing temperatures and environmental influences.

Easy processing

Cellular rubber gaskets can be produced as strips, moulded parts or cut pieces. Processing is often carried out by punching, cutting or waterjet, allowing the gaskets to be precisely adapted to the respective geometry.

Additional insulating effect

In addition to sealing, cellular rubber contributes to sound and vibration damping. This is particularly relevant in technical housings and machine cladding.

Applications

Automotive industry

Cellular rubber gaskets are used for door and housing seals, covers and for decoupling components in order to reduce noise and vibration.

Construction

In construction, they serve to seal joints, window and door connections and transitions where uniform compression is required.

Mechanical and plant engineering

Typical applications are housing seals, control cabinets and technical cladding where the ingress of dust and moisture is to be limited.

Electrical engineering and electronics

Cellular rubber gaskets protect electrical components from environmental influences and contribute to the insulation of housings and covers.

Medical technology

In medical technology, cellular rubber gaskets are used in devices and systems where a clean, uniform seal is required.

Technical specifications

• Material: EPDM, NBR, CR (chloroprene)
• Density: approx. 0.1–0.6 g/cm³, depending on grade and application
• Temperature range: approx. -40 °C to +100 °C, material-dependent
• Hardness: approx. 15–30 Shore A
• Compression set: low with professional design

Packaging and delivery

Cellular rubber gaskets are delivered in transport-safe packaging and are suitable for storage in industrial environments. Depending on the version, cut pieces, strips or moulded parts are available to support integration into existing processes.

Selection and design of cellular rubber gaskets

The selection of a suitable cellular rubber gasket depends on the interaction of installation situation, medium, temperature range and required sealing effect. What is decisive here is less the absolute material thickness than the ratio of gap dimension to compression.

Gap dimension and compression

Cellular rubber gaskets work via controlled compression. In practice, a compression of about 20–40 % of the material thickness has proven effective in order to achieve a uniform seal and keep the compression set low.

Material selection according to the application environment

EPDM is suitable for applications involving water, weathering and ozone exposure. NBR is preferably used when oils, greases or fuels occur. CR offers a balanced compromise between mechanical load capacity and ageing stability.

Formats and production

Cellular rubber gaskets can be produced as continuous strips, frames, punched parts or individual cut pieces. Cellular rubber sheets are often used as the starting material, from which the required geometries are precisely manufactured.

Bonding and installation

For many applications, self-adhesive versions are used in order to simplify installation and ensure defined positioning. Alternatively, fixing is carried out mechanically by insertion, clamping or bolting.

Typical application limits

Cellular rubber gaskets are suitable for static sealing. For dynamic applications with relative movement, high pressures or continuous media exposure, other sealing systems are generally used.

Quality and reproducibility

For industrial applications, consistent material quality is decisive. Constant density, defined compression hardness and reproducible dimensions support reliable series production and simplify design.

Further information

For applications with surface sealing or as cut-to-size material, cellular rubber sheets offer a suitable foundation for individual further processing.

Frequently asked questions about cellular rubber gaskets

What are cellular rubber gaskets?

Cellular rubber gaskets are gaskets made of synthetic rubber with a closed-cell structure. This structure enables a uniform seal against dust, air, moisture and light liquids.

What are cellular rubber gaskets used for?

They are used, among other things, in the automotive industry, in mechanical engineering, in construction and in electronics. Typical applications are housing seals, covers, joints and technical cladding.

How do cellular rubber gaskets differ from other gaskets?

Compared with open-pore materials, cellular rubber gaskets do not absorb liquids or gases. The closed-cell structure ensures a constant sealing line and additional heat and sound insulation.

Are cellular rubber gaskets weather-resistant?

Depending on the elastomer used, such as EPDM or CR, cellular rubber gaskets are suitable for applications involving weathering, moisture and ozone exposure.

How are cellular rubber gaskets installed?

Installation is carried out by insertion, pressing, bonding or mechanical fixing. Cellular rubber gaskets can be easily cut to size and adapted to the respective geometry.

How long do cellular rubber gaskets last?

The service life depends on material, compression and application environment. With professional design and static application, cellular rubber gaskets achieve long service lives.

Can cellular rubber gaskets be individually adapted?

Cellular rubber gaskets are available in various densities, thicknesses and hardness grades. Cut pieces, frames or moulded parts can be adapted to specific requirements.

How can the quality of a cellular rubber gasket be assessed?

Quality characteristics are a uniform cellular structure, constant density, clean cut edges and a defined restoring behaviour under compression.