SCHOTT PYRAN® fire-resistant glass

PYRAN® has been a leading glass for many decades thanks to a groundbreaking combination of borosilicate glass and the float manufacturing process. This results in a range of excellent technical properties, including an ability to withstand large temperature differentials, high viscosity and no NiS crystals. PYRAN® tempered borosilicate glass has a far superior ability to withstand temperature differentials compared to conventional soda-lime safety glasses. With a higher softening temperature, PYRAN® is self-supporting for over 30 minutes, enabling the production of very large panes. The high viscosity and durability of borosilicate glass results in low flow behavior, providing fire resistance times in excess of 90 minutes. The chemical composition of borosilicate glass prevents the formation of nickel sulphide (NiS) crystals, offering reliability and preventing spontaneous fractures.