How Tempered Glass is made by PRL Glass Systems Inc.
How to Temper Glass
Tempered glass, or toughened glass, is glass that has been heat-treated to make it stronger, more resistant to heat and break in a way to prevent injury. Tempered glass is used in front doors, shower stalls, fireplace doors and grates, and anywhere strong, safe glass is called for. The process for tempering glass is similar to the process for tempering steel; below are the steps for how to temper glass.
Cut the glass into the desired shape first.This has to be done before the glass is tempered, as the tempering process will weaken the glass if it is cut or etched afterward and may increase the likelihood of breakage.
Inspect the glass for imperfections.Cracks or bubbles may cause the glass to break during tempering; if any are found, the glass cannot be tempered.
Sand the cut edges smooth.This removes any burrs created during cutting or etching.
Wash the glass.This removes any tiny grains of glass deposited during sanding, as well as any dirt that may interfere with the tempering process.
Heat the glass in a tempering oven.Glass may be fed in batches or continuously. The oven reaches temperatures of over 600 degrees Celsius (1,112 degrees Fahrenheit), with the industry standard being 620 degrees Celsius (1,148 degrees Fahrenheit).
Quench the glass to cool it.The heated glass is subjected to seconds of high-pressure blasts of air at various angles. The rapid cooling causes the outer surfaces of the glass to cool and contract faster than the center, giving the tempered glass its strength.
QuestionHow do I turn regular glass into high-temperature-resistant glass?wikiHow ContributorCommunity AnswerMelt 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.Thanks!
QuestionCan l drill a hole in tempered glass? If I do, what will happen?Matt ChaseCommunity AnswerAbsolutely not. All holes, etching, sanding edges, and cutting must be done before tempering, otherwise the glass will break.Thanks!
QuestionWhen heating the glass, how does the glass need to be supported?wikiHow ContributorCommunity AnswerThe glass is supported by ceramic rollers in an oscillating heating chamber.Thanks!
QuestionCan toughened glass be reused by being remelted, like annealing in steel?wikiHow ContributorCommunity AnswerYes, but make sure not to use congealing liquid anywhere near the glass, as it can evaporate.Thanks!
QuestionCan I temper glass in a regular cooking oven?wikiHow ContributorCommunity AnswerYes. Pour ice cold water on it after running it in your oven at the maximum temperature.Thanks!
QuestionIs tempered glass made from float glass first?wikiHow ContributorCommunity AnswerMost 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).Thanks!
How is glass tempered after heating and rapidly cooling?
Can I temper wine and beer bottles? If so, what is the best method?
If you try to do this in your kitchen oven how long do you need to heat it?
What is necessary for bowing or warping things made of glass?
Is it normal for the glass to develop a curve during the tempering process?
- Properly tempered glass is required to withstand pressures of at least 10,000 pounds per square inch (68,948 kilopascals) before it breaks, but usually it can withstand pressures of at least 24,000 psi (165,475 kilopascals). When broken, tempered glass breaks into small, usually rounded pieces. Annealed glass, which is heat-treated by a different process, breaks at only 6,000 psi (41,369 kilopascals) and may break in large, jagged shards.
- Tempered glass can withstand temperatures of up to 243 degrees Celsius (470 degrees Fahrenheit) on a constant basis. Temperatures higher than this will weaken the glass. Exposure to temperatures near those at which it was tempered initially will cause it to shatter.
Video: Tempered Glass Production
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