China Tempered Glass For Sanitary Ware factory Tempered glass with shining polished edges. Holes and shapes according to customer's drawing, made by water jet cutting, inside hole edges grind by CNC grinding machine. About Toughened glass / Tempered Glass/ Heat Strengthened Glass Toughened Glass is also called tempered glass, heat strengthened glass. Tempered glass has been processed intense heating and rapid cooling in a controlled process.website:http://www.temglass.com/tempered-glass-for-sanitary-ware/