We only use superior quality rubber materials. Our materials have excellent elasticity, wear resistance and tensile resistance, and they all have ROHS, RACH, PAHS Certification. We will test every new batch of materials and keep the test report. We will return all unqualified raw materials to our suppliers. If you don't know what rubber material you should choose. Our technicians can choose materials for you according to the use place of O-ring. Product Name: Rubber O-Ring Material: NBR, EPDM, SIL(VMQ), FKM(VITON), CR, FVMQ, HNBR Standard: AS-568, JIS B2401, Customized Our rubber O-rings are produced by molding, we can control the dimension of products very precisely. The minimum tolerance of our products can be ±0.08mm. Color: Black, White, Red, Green, Yellow, Brown, Purple, Transparent We have more than 2000 sizes of O-rings now, they include all of AS-568 standard, all of JIS B2401 standard and more than 1500 non-standard sizes. If you purchase O-rings from us, you can save a lot of mold cost. Certification: IATF16949:2016 We have 6 departments and more than 300 employees. We have a professional technical team, they will strictly control the products quality and provide after-sales technical support for our customers. At the same time, our technical team can also develop new products for customers according to drawings or samples.