1. Oil proof auto seal. 2. Heat resistant. 3. Good quality auto seal. 4. Certification: ISO9001:2008, ISO/TS16949,etc. Auto seal descriptions: 1. Materials ... , CR, SBR, SI, FPM, IIR, VT etc. 2. Characteristics: oil proof, aging resistant, heat resistant, wear resistant, chemical resistant, anti-corrosion ...