Reviewing performance to select the rubber required

In Table 1, rubbers have been classified by Type and Class according to the ASTM D2000 and SAE J200 nomenclature.

Type refers to heat testing results and defines the maximum application temperature. The letters A to J denotes a temperature range from 70oC to 270oC.

Class, on the other hand, denotes oil resistance based upon the oil immersion test (refer to ASTM#3) and the maximum percentage volume swell. Letters A to K indicate the ten different levels of oil resistance.

Type and Class are written together. For example, a Type and Class of AK means that the rubber can be applied for extended periods under 70oC. When soaked in oils listed in ASTM, the volume swell of the rubber will not exceed 10%.

Table 2 lists typical specifications included in ASTM D2000 and SEA J200. This list is not exclusive. Other polymers may be reviewed using the same specifications as well.