... Seal. 3. Certification: ISO9001:2008, TS16949,ROHS,etc. Industrial High Quality Bolt Seal descriptions: 1. Materials: can be EPDM, NR ... chemical resistant, water proof, hot water proof and steam proof, good insulation property, good elasticity and high tensile strength ... electrical appliance, industrial, construction, and other fields Bolt Seal. 10. QC/QA: we have strict quality control and assurance ...