Q&A for How to Temper Glass

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Question

Can l drill a hole in tempered glass? If I do, what will happen?

Matt Chase

Community Answer

Absolutely not. All holes, etching, sanding edges, and cutting must be done before tempering, otherwise the glass will break.

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Question

How do I turn regular glass into high-temperature-resistant glass?

Community Answer

Melt the glass with up to 50% boric acid to make Pyrex. It will make it much more resistant to breaking from heat shock, and will lower its melting point.

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Question

When heating the glass, how does the glass need to be supported?

Community Answer

The glass is supported by ceramic rollers in an oscillating heating chamber.

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Question

Can toughened glass be reused by being remelted, like annealing in steel?

Community Answer

Yes, but make sure not to use congealing liquid anywhere near the glass, as it can evaporate.

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Question

Can I temper glass in a regular cooking oven?

Community Answer

Yes. Pour ice cold water on it after running it in your oven at the maximum temperature.

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Question

Is tempered glass made from float glass first?

Community Answer

Most glass is made using the floating process nowadays, so, yes, tempered glass is made from float glass. However, other glass production methods can also produce glass that can be tempered (as long as there are no bubbles or irregularities).

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