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What is QUARTZ GLASS?
Also see glass.
Quartz is found as colorless transparent crystals which are practically pure silica. It is both difficult and expensive to produce in any form. It has good mechanical strength and almost perfect elasticity. Because its coefficient of expansion and contraction is near zero, it can be processed into some of the finest optical devices available. Quartz bulbs can be used continuously at 900 degrees Celsius, and intermittently to 1200 degrees Celsius provided it is not in contact with contaminating materials which can cause the onset of divitrification.
references for this page: QUARTZ GLASS, QUARTZ
references to this page: ARC TUBE, DIVITRIFICATION, GLASS, HALOGEN BULB