The EPDM cellular rubber consists of ethylene-propylene-diene rubber, is a terpolymeric elastomer and is the most commonly used rubber compound for many outdoor applications. The cellular rubber is made into a foam in a special process (expansion) and has a closed cell structure without outer skin, making the material airtight and waterproof. The rubber compound is characterized by a very good weather resistance and ozone resistance and is extremely durable, due to the very good aging resistance. Resistance to diluted chemicals, acids and alkalis is good.
The cellular rubber is a foam in the commercial hardness or density and adapts under light pressure immediately and very well to uneven surfaces. The good recovery behavior (i.e., the material returns to its original shape) allows for optimal sealing. A compression of the material from 30% to max. 50% before sealing is recommended, with a compression of more than 50% damaging the material structure and greatly reducing the recovery behavior.
