SAE J515 Designations and descriptions for O-ring materials are shown in Table 1 . ASTM/SAE
Type and Class are from ASTM D 2000 and SAE J200.
TABLE 1—DESIGNATIONS AND DESCRIPTIONS FOR O-RING MATERIALS
CH Nitrile Elastomer, 90 Durometer Hardness, Good for temperature range of –30 °C to 1 25 °C for petroleum-based fluids
CA EPDM Elastomer, 80 Durometer Hardness, Good for temperature range of –40 °C to 1 25 °C for water-based hydraulic or nonpetroleum-based fluids
HK Fluorocarbon Elastomer, 90 Durometer Hardness, Good for temperature range of –1 5 °C to maximum temperature of 275 °C for petroleum or nonpetroleum-based fluids
SAE Type CH was SAE Type 1 : Type CA was SAE Type 2 and Type HK was SAE Type 3.
Material Specifications. O-rings shall conform to the specifications in Table 2
