... good insulation property, good elasticity and high tensile strength rubber washer, etc. 3. Hardness: 30~90 shore A or ... black, transparent, green, red, yellow, grey, purple, pink rubber washer, etc. or upon your color codes. 6. Processing: all manufacturing ... mechanical, industrial, construction, household, medical and other fields rubber washer. 10. QC/QA: we have strict quality control and assurance ...