Deutsch English

Cellular rubber - the material

Cellular rubber is a porous, closed-cell rubber manufactured using the expansion process. It is based on natural rubber or synthetic rubbers such as EPDM and other elastomers. Cellular rubber is available in versions with various ASTM resistance ratings. The cells inside the rubber are not linked to each other and it is this property that makes cellular rubber airtight and watertight. Cellular rubber differs from sponge rubber in that it does not need an outer skin if it is to be used as a seal.

Cellular rubber
Cellular rubber - closed cell
Sponge rubber
Sponge rubber - open cell

Cellular rubber is manufactured in blocks on very large presses. At this stage in the production process the cellular rubber block has an all round closed skin which generally speaking does not serve any purpose. Later on the skin is removed and disposed of as process waste.

The composition of the rubber mixture is varied to produce different properties and in this way the product can be varied to match the requirements of a particular application.

We can supply all the most widely used types of rubber including natural rubber (NR), chloroprene (CR) rubber, EPDM rubber, nitrile rubber, all with various stress-strain compression ratings.

Technical data

  • Excellent sealing properties
  • Low heat conducting values (approx. 0.04 W/mK)
  • High compressibility
  • Good insulation properties
  • Low water absorption
  • Easy to work
  • EPDM - mixture with high temperature and ageing resistance
  • CR/NBR - mixture with high flame retardance rating and high resistance to oils

Processing methods

Cellular rubber blocks

Blocks of KÖPP cellular rubber are cut into sheets or can be glued whole to webs for processing later into roll form. Sheets and rolls can be treated with a self-adhesive finish.

Cellular rubber sheets and rolls can be used to make cut-outs, punched items, strips and profiles. The material can be lathed and milled. The material can also be processed using water jet cutters.

During production, when the cellular rubber blocks and rolls are split, our quality assurance department makes regular checks to ensure that material thickness and other quality parameters such as tensile strength and gauge remain consistent and up to standard.

Go here to find out about other applications for our products.
Find out more about other applications for our product »