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  1. Aug 8, 2021, 01:16 PM #1
    Jon
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    Rolling a sheet of liquid glass. PPG Industries. 1940.

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    cmarlow (Aug 8, 2021), jimfols (Aug 8, 2021), Toolmaker51 (Aug 8, 2021)
  3. Aug 8, 2021, 03:02 PM #2
    cmarlow
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    It looks like he is blowing compressed air at it. Does anybody know why?
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  4. Aug 10, 2021, 01:55 AM #3
    old kodger
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    Quote Originally Posted by cmarlow View Post
    It looks like he is blowing compressed air at it. Does anybody know why?
    I'm not sure in this instant, but I do know that to make toughened glass they heat it and quickly cool the surface which makes the outside shrink causing a tension In the plate, which is why, if you try to cut toughened glass it will shatter because you've released the tension in a local area.
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