Resistance to Temperature Gradients

FireLite’s stability in fire is particularly shown by a capability to sustain high temperature differentials that would threaten thermal stress failure of other glazing types – for example, at least three times greater than for modified toughened soda-lime-silica glass, and more than double differentials sustainable by toughened borosilicate.

ProductReference StandardSustainable Thermal Differential, ℃
FireLiteBS EN 1748-2-1:2004650
Toughened borosilicateBS EN 13024-1:2011300
Toughened soda-lime-silica floatBS EN 12150-1:2000200
Borosilicate (e.g. Pyrex ovenware)BS EN 1748-1-1:200480
Soda-lime-silica glass (float glass)BS EN 572-1:200440

Conventional glass products under thermal stresses are sensitive to edge and surface condition. In normal isotropic glass bodies, surface micro and macro flaws produced during handling and use can act as critical stress concentrators under the severe uncertain and arduous conditions produced by fire.

Toughened (also known as tempered) soda-lime-silica glass, i.e. normal “window” glass composition, can be especially vulnerable to premature failure due to that mechanism.

FireLite is not vulnerable in the same way since significant failure stresses are not generated when it is heated suddenly or to high temperatures - or rapidly cooled from a hot condition.