7. Acceptability criteria

7.1 Glass breakage due to thermal stress

A temperature gradient can develop in glazing when it is partially exposed to sunlight. The temperature difference between the center of the glazing and the coldest edge generates thermal stresses that can cause the glazing to break if the difference exceeds a certain critical value.

Depending on their nature (printed glass, laminated glass, etc.) and the condition of their edges, annealed glass can withstand temperature variations of between 20 and 40°C.

Tempered or hardened glass can withstand temperature variations of 150 to 200°C.

Justifications for glazing against thermal breakage are given in NF DTU 39 of July 2012, part 3: "Memento calculations of thermal stresses"....

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Acceptability criteria

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Conclusion

Bibliography

TIMOSHENKO-WOINOWSKY (K.) - Théorie des plaques et coques. - Librairie Polytechnique Béranger, 2e édition (1961).
Prescriptions techniques des vitrages extérieurs collés. - Cahier du CSTB, 3488, V2, mars 2011.

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Norms and Standards

Glass in construction – Determining the luminous and solar characteristics of glazing - NF EN 410 - 04-11
Glass in construction – Determination of thermal transmittance, U – Calculation method. - NF EN 673 - 04-11
Appendix A – Solar shading devices combined with glazing – Calculating solar and light transmittance – Simplified method - NF EN 13363-1 - 05-04
Appendix B – Solar shading devices combined...