VitroBloc™ – Plastic film antiblock additive are made from post-industrial sources of reinforcement fiberglass byproducts. VitroBloc feedstocks are pure glass, free of crystalline silica or other impurities. The VitroBloc™ – Plastic film antiblock additive grades are white powders finer than 40 μm top size with a very low level of minus 5 μm fines. The products are designed for excellent blocking and clarity properties utilizing a recycled powder.