Material below .005 inches in thickness is classified as molybdenum refractory foil. Typical uses for it are production of drawn parts, electronic components, metallizing sources, furnace insulation and chemically etched parts. Can't find the exact...
Etched molybdenum foil, of all metals, is used since its coefficient of expansion is the closest to quartz. The elliptical shape produces an air and gas tight lead into the lamp envelope, thus preventing filament degradation during lamp operation....
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