... , UPVC pipe, polyethylene-aluminum compound pipe, PE-X (cross-linked polyethylene) and polybutylene pipe etc. For this reason PP ... 2-2002(National Standard)Factory Certification: ISO9001, ISO14001Applications: Cold or hot water supply, heating system, industrial liquids ... resistance.6. Beautiful Appearance & Higher Flow Capacity:Smooth inner and outer surfaces, less flowing resistance, soft color ...