... before mass production(NR,BR,NBR,SBR,CR,EPDM etc) rubber seal Features:1. Materials advice: silicone and ... also NBR, SI, HNBR, SBR, CR, BR, IIR, NR, etc),as your request , Environmental Friendly.2. Application: automotive, machinery, ... bathroom facilities, household electrical appliances etc.3. Certifications: All manufacturing processes confirm to ISO9001-2008, ...