
Tempered Glass:
It has low resistance to the attack of chemical products, vapours and thermal shocks. When in touch with the ambient, allows temperatures up to 80°C. In other cases, the highest temperature allowed is of 220o.C. .
Cor: green hue.
Visual aspect: for both cases it shows a greenish hue if seen by the glass thickness. In frontal view it has excellent transparency and clearness.
Maximum sizes:
- Circular tempered glass: diameter of 2000,0 mm. Variations can occur according to the thickness.
- Rectangular glass: 3120,0 X 2220,0 mm. In thinner densities it can be smaller.

Calculation to determinate the ideal thickness of the circular sight-glass in tempered crystal: