#AskGlaston Episode 36: Does the overall glass strength weaken when saw cuts are applied?

Today we are dealing with the following two questions:
  1. Does the overall glass strength weaken when saw cuts are applied?
  2. Is tempered glass more scratch resistant than annealed glass? If it is, then how much?
For today's questions, see our full video response below!

Does the overall glass strength weaken when saw cuts are applied?

Short answer is yes. Whatever we do, notches, holes, poor edge work, cutting, door hinges – all of these decrease the bending strength of tempered glass.

What to consider when heat strengthening 12 mm glass in a very large furnace?

Tempered glass and annealed glass do not have, in practice, any difference in terms of scratch resistance. In theory, if we think about tempering process, it does introduce compressive forces that close these microscopic scratches on the surface of the glass, so in theory, in microscopic level, tempered glass is more scratch resistant. There are certain standard in EC and ISO that define these but all of these are laboratory testes – in practice there’s no difference between tempered or annealed glass when it comes to scratch resistance.

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About the author

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Miika Äppelqvist

Encourages transparent solutions in buildings and ways of working. Seven years of experience from being a glass-man in product management, sales and projects with a focus on glass heat treatment. Believes helping is the best marketing any company can do. Father of two toddlers and a wannabe sportsman with an internal love of ice hockey.