Polycarbonate sheet plastic is used to make shatterproof windows; it’s is clear as glass and is 250 times more resistant to breakage. It's about half the weight of glass, quite durable and energy efficient. This type of plastic is also used for making eyeglass lenses because it is lightweight and protects eyes from UV light. Today greenhouse panels are constructed of polycarbonate sheets because its strong, shatterproof qualities. Find popular brands like Lexan and Polymershapes in both sheets and rods.