... about AS568, JS, BS, metric o rings.Description of High Quality Standards O Ring for Chemical Resistant:1. Materials: can ... FLS, CR, SBR, SI, BR, IR, EPDM, IIR, butyl, PU, E/A, ECO, CSM, VITON, FKM, FPM, etc.2. Characteristics ... other fields. 9. QC/QA: we have strict quality control and assurance systems, have 30 QC technicians and ... . Best Regards! can be NR, SI, EPDM, PU, VITON, etc.1. Quick shipment.