Polycarbonates are tough, amorphous and transparent thermoplastic polymer. Comprising of carbonate groups linked together, they offer unique engineering advantages. Polycarbonate sheets are almost as clear as glass and more than two hundred times stronger than it. But what makes polycarbonate roofing sheets stand out is indeed their transparency. Another advantage polycarbonates offer is that they are heat resistant and can be combined with flame retardant materials without significant material degradation. Polycarbonate roofing sheets are lightweight and therefore are easy on the columns for structural support.