... Bolt Seal. 3. Certification: ISO9001:2008, TS16949,ROHS,etc. Industrial High Quality Bolt Seal descriptions: 1. Materials: can be EPDM, NR, HNBR ... . Applications: automobile, electrical appliance, industrial, construction, and other fields Bolt Seal. 10. QC/QA: we have strict quality control and assurance systems ...