Glass > Resistance against sudden temperature changes and temperature differentials
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Principles
Glass may fracture due to temperature differentials created by solar heating of the glass, in particular where part of the glass is cooler due to the frame or shading.
Glasses that resist higher temperature differentials will perform better. For instance toughened glass has a resistance temperature of 200oC and is not prone to thermal fracture whereas annealed glass has a resistance temperature of 40oC and will be susceptible to thermal fracture in some locations and uses.
Standards
The values of resistance temperature for each type of glass are given in the relevant product standard.
Method of test
The resistance temperatures are standard physical characteristics of the glass.
Classification
There is no classification of resistance against sudden temperature changes and temperature differentials. A value of temperature is given on the CE mark.
CE Marking
UK building regulations do not refer to thermal fracture of glass
| Location | npd allowed |
| England and Wales | Yes |
| Scotland | Yes |
| Northern Ireland | Yes |