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How To Temper Glass
Nov 15, 2017

Tempering glass can be quite the challenge. It requires heating glass to a very high temperature and then allowing the glass to cool quickly. This alters the molecular composition of the glass in such a way that the glass becomes up to six times harder than normal glass, but at the same time it is more brittle. One advantage to tempered glass (besides the extra strength) is that if tempered glass should break it crumbles into safe chunks rather than sharp and potentially dangerous shards.


Instructions


1.  Shape or drill any holes in your glass before tempering. Once your glass is tempered it can not be cut or drilled without shattering into small thumbnail-sized pieces.


2.  Heat the glass you wish to temper to a temperature of at least 600 degrees Fahrenheit in an oven ora kiln.


3.  Remove  the  glass  from  the  oven  or  kiln  (carefully,  using  tongs  ora  special  paddle  made  for handling hot glass) and set It on a brick or cement surface and allow it to cool quickly by fanning it with cool (but not cold) air. It is the quick cooling of the outside surface of the glass that causes the molecular changes that make the glass tempered. Allow the glass to cool completely.


4.  Check to see if your glass has been properly tempered by looking at It with polarized giasses  and  shinning  light  through  it.  Tempered  glass  will  have  patterns  of  shadows  (sometimes  called "quench marks") visible with polarized lenses.





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