Nneɛma a wɔde yɛ rɔba a ɛte sɛ nhama a wɔde fa gas, nsu, slurry anaa nneɛma a ɛyɛ granular. Ɛyɛ rɔba a ɛwɔ mu ne akyi ne nnompe a ɛwɔ mu, na nneɛma a wɔde yɛ nnompe no betumi ayɛ cotton fiber, synthetic fiber ahorow, carbon fiber anaa asbestos, dade waya, ne nea ɛkeka ho Mpɛn pii no, wɔde abɔde mu rɔba, styrene-butadiene rɔba anaa butadiene rɔba na ɛyɛ hose no mu ne akyi rɔba; wɔde neoprene ne nitrile rɔba na ɛyɛ hose a ngo ntumi nkɔ mu; Wɔde ethylene propylene rɔba, fluorine rɔba anaa silicone rɔba, ne nea ɛkeka ho na ɛyɛ hose a ɛko tia acid ne alkali, a ɛyɛ hyew kɛse.

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