Duralex glass products are tempered. The mechanical and thermal resisting properties are considerably increased compared to other ordinary glassware products. Duralex Products are 100% recyclable, glass is made to be remade. Glass is one of the most recyclable materials on the planet. All products are made of soda-lime glass created from sand, soda ash and limestone. Completely lead and cadmium free. Unlike boron-based cooking or pharmaceutical glass, is fully recyclable. We have also made a strong commitment to reduce the impact of our manufacturing processes by installing a state-of-the-art melting furnace to reduce energy consumption.