Saturday, May 26, 2012

Tempered Glass Expert Discusses Glass Edge Finish











California glass expert discusses the importance of edge finish on tempered glass. Tempered soda lime glass has replaced low expansion borosilicate glass for small oven doors and glass tops for cookware. This reduces costs, but can reduce reliability. One important aspect of these tempered glass pieces is the edge quality. Poor edge finishing can introduce defects that can cause eventual failure. There are three common edge defects. These are chipping, missed seaming and "dry" seaming. Normally these pieces are scribed and broken, seamed with a wet belt sander and tempered. These three edge defects are illustrated by the figures. Read Consulting failure analysis lab has looked at numerous tempered glass failures that have originated at the edge; thus, edge finish is extremely important for any glass piece that can be preferentially heated in the center.

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Monday, May 07, 2012

Tempered Glass Expert Discusses Edge Finish


Tempered glass expert reminds those using tempered glass as oven doors or in other applications where the glass will be non-uniformly heated that the glass edge finish is critical. If the center of the glass door is heated first, the door edge is put into tension. If the edging is poorly done,
the door can fail spontaneously. Numerous failure analysis performed on tempered glass failures have shown the door failure to commence on the edge as a result of heating of the door center.

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