1.5 inch professional polyethylene plastic sheet for Swimming Pools 1.5 inch thick INDUSTRIAL hdpe sheets White-HDPE sheets 4×8 1.5″ White HDPE Sheet Cut-to-Size 51572104-CTS HDPE (High Density Polyethylene) has a ntinuous use temperature range of -50°F (-46°C) to 180°F (82°C).