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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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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