Cellular rubber seals
Cellular rubber is also known as cellular rubber and is a closed-cell, foam-shaped elastomer. The material is used, among other things, for insulation, sealing, soft bearings, isolation and deadening.
Available cellular rubbers at Rehm Dichtungen Ehlers GmbH
We supply cellular rubber in sheet form. Our various manufacturing processes allow us to process cellular rubber into individual products, such as blanks, gaskets or flat gaskets or strips. During production, we keep the degree of shrinkage as low as possible. Our measured values are the standard for determining the possible tolerable deviations and are relevant to the evaluation of the acceptance of complaints.
We generally recommend that cellular rubber material always be processed immediately after receipt of goods.
Qualities
Cellular rubber CR NBR UL94
CR (chloroprene) cell rubber is resistant to heat and various weather conditions. In addition, CR cellular rubber is resistant to light acids, oil and alkalis.
Technical data sheet:
Properties:
| Hardness [Shore A] | ASTM D 2240 | 5-10 |
| Density [kg/cm³] | ISO 1183 | 150 +- 25 |
| Tensile strength [MPa] | ASTM D 412 | 1270 |
| Elongation at break [%] | ASTM D 412 | >250 |
| Tear resistance [kN/m] | ASTM D 1056 | 0,43 |
| Operating temperature range | -40° / +100° C |
Cellular rubber EPDM
EPDM cellular rubber is very resistant to ageing, ozone and UV light. EPDM cellular rubber is particularly suitable for outdoor use.
Technical data sheet:
Properties:
| Hardness [Shore A] | ASTM D 2240 | 5-10 |
| Density [kg/cm³] | ISO 1183 | 140 +- 25 |
| Tensile strength [MPa] | AFNOR NF R99211-80 | 0,6 |
| Elongation at break [%] | ASTM D 412 | >150 |
| Compression set [%] | ASTM D 1056 | 30 (22h / 23° C / 50%) |
| Operating temperature range | -40° / +90° C |
The properties of cellular rubber as a sealing material
The basic framework for cellular rubbers are elastomers to which auxiliary materials such as fillers, plasticisers, anti-ageing agents and others are added. Altogether, there are four main groups of elastomer compounds that are processed into cellular rubber:
- Natural rubber
- EPDM (Ethylene Propylene Diene Monomer)
- CR (chloroprene rubber)
- NBR (acrylonitrile butadiene rubber)
Cellular rubber is produced in an expansion process. The cells of the resulting foam-like elastomer are not connected to each other - for this reason, cellular rubber is waterproof and airtight. The material is usually vulcanised in moulds and then cut into sheets. Due to vulcanisation, the material shrinks over time as gas driven into the cells gradually escapes. The higher the temperature load on the cell seal and the thinner the material, the higher the shrinkage.
The advantages and material properties of the various cellular rubber
Cellular rubber is characterised by a number of technical properties that make the material usable as a sealing material in various environments.
is cellular rubber:
- Excellent sealing
- temperature-resistant
- Highly ageing resistant
Furthermore, the material has a low thermal conductivity value and therefore insulates well. Due to its high compressibility, good damping properties and water impermeability, cellular rubber is suitable for many areas of application. Furthermore, cellular rubber is easy to compress. In addition, self-adhesive cellular rubber enables simple and clean installation.
Areas of application for cellular rubber seals
Thanks to its properties, cellular rubber is a versatile material. For example, cellular rubber can be used as a gasket or flat seal, shock absorber or edge protector. Cellular rubber is suitable for use in industries such as the automotive sector, the construction industry, but also in electrical and air conditioning technology as well as in the aerospace industry. In addition, the material is also used in medical technology and in the sports & leisure sector due to its biocompatible properties.
We will be happy to answer whether cellular rubber is also suitable for your purposes. Please contact our customer service, who will be happy to provide you with comprehensive advice.