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Devitrification on Projection Lamps
Devitrification develops on glass during the firing process of fused glass whereby the surface of the glass develops a whitish scum, cracking , or wrinkles instead of a smooth glossy shine, as the molecules in the glass change their structure into that of crystalline. This will in some cases causes glass to rupture or cause burning smell in as little as 1 hour under these conditions.
Causes of devitrification, commonly referred to as "devit", can include holding a high temperature for too long, which causes the nucleation of crystals. The presence of foreign residue such as dust on the surface of the glass or inside the kiln prior to firing can be a key nucleation points where crystals can propagate easily.
A technique for avoiding devitrification is simply vacuuming out the dust in the vents of your television or projector. This deep vacuuming of the unit will greatly diminish any devirification from taking place.
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