Available in a variety of colors to harmonize or contrast with the vision area, the porcelain enamel frit is applied to the surface of the glass. Porcelain enamel frits contain finely ground glass mixed with inorganic pigments to produce a desired color.
The coated glass is then heated to about 1,150°F, fusing the frit to the glass surface, which produces a ceramic coating almost as hard and tough as the glass itself. A fired porcelain enamel frit is durable and resists scratching, chipping, peeling, fading and chemical attacks.
Spandrel glass can be installed monolithically, using insulated metal backpans, but is more often found as a component of an insulating glass unit. Reflective spandrel glass units are widely used when a uniform all-glass look is desired for the building exterior. Typical applications include commercial fixed windows, curtain walls, storefronts and wall cladding. Spandrel glass is traditionally an opaque material not intended for use in vision areas.
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