... .l: SG-3, SG-5, SG-8Quality standard: GB5761-93Properties and features:PVC Granule is with the Carbide base, we produce ... , etc.2. SG-5: Rigid plate, gramophone record, value and welding rod, PVC pipes, PVC windows, doors ,etc.3. SG-8: Good hardness ... and high strength, mainly used for tubes and pipes. Quality Index:ItemsSG ...