Franco Belge

ROBAX® glass-ceramic features a thermal capacity way exceeding that of traditional tempered glass. Tempered glass is usually restricted to applications that don't exceed 500F. However, ROBAX® is meant to work at temperatures starting from -400F. to and +1400F.
It is used in cookware, to missile nose cones and astronomical telescope mirror substrates. Transparent glass-ceramic, introduced in 1970s, is much more difficult and expensive to make than ordinary glass. As a result, it also has a different appearance including color, surface texture, and some small bubbles or inclusions that are natural to its composition and have no effect on its strength or performance.