... lines 5.Good qualities Polycarbonate Sheet ( PTBOFAN),PC sheetSpecifications:1) Thickness: 4mm, 4.5mm, 5mm, 6mm, 8mm, ... , green, opal, brown, blue green etc.1) Impact strength: The impact strength of solid PC sheets is 250 times that ... of glass, and the impact strength of hollow PC sheets is 80 times ... Thermal insulation: The K-value of glass is 1.2 times that of solid a PC sheet ...