The linear dimensions of our sheets are nominal and they have a tolerance of +-1/8" in each direction (length and width) Polycarbonate is clear and smooth on both sides Forming Temperature: 360 - 400 degrees Fahrenheit Thermoforable Brand Names for Polycarbonate: Lexan, Perspex, Makrolon, Tuffak, Speatech, Acrylate. Great for vacuum forming All dimensions are nominal. Unlimited Thermoform Plastic Sheets are perfect for inventors, small businesses, and DIY hobbyists who want to make custom vacuum formed plastic parts.