The chemical structures of special-purpose rubbers are designed to meet requirements relating to one or more factors unique to the environment in which a product is to be used. These can include mineral oils, harsh outdoor environments, exposure to intense UV light, high ozone content, moisture or chemicals. Special-purpose rubbers are used and produced in large volumes on the market, primarily in the construction and automotive sectors.
This group includes standard types of EPDM, CR, CSM, IIR, CIIR, BIIR, and NBR and different variants thereof:
2c. Low-viscosity (viscous) NBR
2d. Pre-crosslinked NBR
2e. Bimodal NBR