This 2025 technical report analyzes four major rigid PVC pipe classifications: PVC-U: Cost-effective solution for water supply/drainage (GB/T 10002.1 compliant) PVC-C: Superior heat resistance (up to 93°C) for industrial chemical transport PVC-O: Molecularly oriented for 2X pressure resistance in mining/gas applications PVC-M: Impact-modified for extreme weather conditions (-30°C to 60°C)