shanghai hongsheng auto parts co ltd is a profession manufacturer for auto rubber products including as568 o rings，Japan standard o rings,European standard o rings ;All of our rubber material are imported from famous companies: Viton, FKM, FPM and FFKM from US DuPont, HNBR from Germany LANXESS, Silicone from Japan Ruiweng and so on. Our products include: International o-ring---ASDM568, JIS, DIN3771 and GB/76-92, washer, X-ring, Y-ring, D-ring, and other customized rubber parts; Wider range of products can meet different requirement for different industries: Auto plant, auto air-conditioner, auto parts, valve &pumps, engineering machinery, hydraulic industry, medical parts, semi-conductor and TFT-LCD line and so on.