Full definition
SAE Recommended Practice J200 — Classification System for Rubber Materials — the automotive industry's standard system for specifying rubber compounds by performance requirements rather than by chemical composition, enabling material substitution between manufacturers as long as performance criteria are met. J200 is equivalent to ASTM D2000 and uses the identical classification system. The designation consists of: grade number (1-10, defining basic requirements), type letter (heat resistance: A=70°C through J=275°C), class letter (oil resistance: A=no requirement through K=maximum), hardness (2-digit code), tensile strength (2-digit code in MPa), and suffix letters with values (detailed requirements for compression set, fluid resistance, low-temperature flexibility, etc.). Common designations with typical elastomers: AA = NR/SBR (no oil requirement), BF/BG/BK = NBR (oil-resistant seals and hoses), BC/BE = CR/neoprene (oil + weather), DA/CA = EPDM (heat + weather), HK = FKM/Viton (high temperature + chemical). Example line call-out: "2BG615 A14 B14 C12 F17" specifies grade 2, type B (100°C), class G (high oil resistance), 60±5 Shore A, 15 MPa tensile, with specific compression set, aging, and low-temperature requirements. Per SAE J200 and cross-reference ASTM D2000. This is the "language" of automotive rubber material specification globally.