24" x 48" x 1/4" POLYCARBONATE CLEAR PLASTIC SHEET LEXAN The linear dimensions of our sheets are nominal and they have a tolerance of +-1/8" in each direction (length and width) Excellent Light Transmission High/Low Temperature Resistance Thermoforable Brand Names for Polycarbonate: Lexan, Perspex, Makrolon, Tuffak, Speatech, Acrylate.