Quote:
Originally Posted by darkminion_17
What is the issue with tempered glass?
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When a glass is tempered, the flat glass gets distorted by the heat, especially around the edges. In the woodworking circles, we use plate glass to flatten stones used for sharpening chisels and hand plane blades. Is it often said to avoid the tempered glass!
Here's a copy and paste from google search:. Immediately after heating, the glass surfaces are rapidly cooled by quenching with air from a series of nozzles. The original flatness of the glass is slightly modified by the heat treatment, causing reflected images to be distorted