... , SI, BR, IR, EPDM, IIR, butyl, PU, E/A, ECO, CSM, VITON, FKM, FPM, etc. 2. Characteristics: good aging resistant, chemical ... ± 5 shore A, and can be ±3 shore A for special products. 4. Size tolerance: exactly upon your request or standard ... , electrical appliance, mechanical, industrial, construction, household, medical and other fields rubber washer. 10. QC/QA: we have strict quality control and ...