Glass expert describes the condition of the edges of windows, mirrors and other flat glass pieces. Almost all flat glass pieces are shaped from larger pieces using glass scribe and break techniques. Thus the edge of the part has two distinct sides. The photograph above is a microscopic picture of a the edge of an […]
Glass Machining Expert Discribes Antique Scribed Edge
Glass expert had he opportunity to examine the edge of antique rolled, ground and polished window glass. This glass was removed from a greenhouse built in 1930. The window glass was sized by glass scribing and breaking it from a larger piece of glass. Above is a photomicrograph of the edge of the window. The […]
Glass Expert Witness Discusses Window Failure
Glass failure analysis expert discusses interesting window failure, that of a piece of antique window glass. The window expert performed a failure analysis that determined the failure initiated at crush damage from the scribing operation, and it started as a bending crack. It then transformed into a “thermal crack”. That is the crack front was […]
Glass Expert Discusses Termpered Glass Cookware
Modern Pyrex glass cookware is now made from tempered soda lime glass. As a result, there is a potential that the tempered glass failure will create dangerous projectiles. In one case it was found that if the temper glass stresses are not symmetrical, flying glass pieces will occur. In the present case, tempered glass cookware […]
GLass Failure Analysis Expert Discusses Wire Glass
Safety glass expert has examined numerous broken wire glass doors and windows. In the past wire glass has been mistaken to be safety glass; however, it is just as dangerous as standard annealed window glass. The wire is bonded between two pieces of semi-soft glass at high temperature. When this “sandwich” cools to room temperature, […]
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