... choice;2)Materials: NR, NBR, SBR, IR, EPDM, BR, CR,Viton, Silicone, etc;3)Packaging: Inner packing is by PE plastice ... -scale certification of material and products, like the UL, FDA, NSF NSF-61, ISO 9001-2000, ISO/TS16949, WRAS, TZW,ACS, DVGW, we ...