Otu klas ngwaahịa rọba tubular eji ebu gas, mmiri mmiri, slurry ma ọ bụ ihe granular. Ọ na-emi esịnede n'ime na mpụta roba oyi akwa na skeleton oyi akwa, na ihe nke skeleton oyi akwa nwere ike ịbụ owu eriri, dị iche iche sịntetik eriri, carbon fiber ma ọ bụ asbestos, ígwè waya, wdg N'ozuzu, n'ime na mpụta roba oyi akwa nke sooks na-mere nke eke roba, styrene-butadiene roba ma ọ bụ butadiene roba; A na-eji neoprene na rọba nitrile na-eguzogide mmanụ; acid- na alkali na-eguzogide, elu-okpomọkụ sooks ka ethylene propylene roba, fluorine roba ma ọ bụ silicone roba, wdg

na-atụ aro: EPDM:S512F;S5890F;S552;S552-1;S6090WF;J-3060P;J-3080;J-3080P;J-3092E;TER 4038EP; TER 4039; TER 4047; TER 4049;
CR: SN121; SN122; SN123; CR111; CR112; SN231; SN232; SN233; SN238; SN239; CR211; CR212; CR213; SN321; SN322; SN323;