Jul 14, 2020 · Features of PVC Sheets - Type 1 Rigid: Normal Impact. High Strength-to-Weight ratio. Resistant to most acid and alkali solutions. Fabrication temporarytility: Can be cut, welded, and glued. Excellent fire ratings (UL 94 V-0) and flame spread <20 per ASTM E-84. Self extinguiHDPEng. nfor to ASTM D1784-07 Class 12454-B.