... Seal, Mechanical Seal and various Joint Strips , Rotatable Rollers, Wearable Rubber products, Special Engineering Plastic products, Metal Materials products. ... to R134A,R12,R22 ) and so on. Best Rubber and its headquarter received ISO9001, ISO9002, and QS9000 certifications ... certification issued by American NSF Organization for plastic and rubber materials, which are suitable for making drinking water ...