They are made from high-purity quartz glass or from single-crystalline sapphire.
From the en.wikipedia.org
He concluded, theoretically, that a highly purified fused quartz glass would be much more efficient.
From the latimes.com
Then a paste composed of plastic and finely ground quartz, glass or silica is patted on in thin layers tinted to match the natural teeth and molded into the desired shape.
From the time.com
Ordinary glass is partially transparent to UVA but is opaque to shorter wavelengths, whereas silica or quartz glass, depending on quality, can be transparent even to vacuum UV wavelengths.
From the en.wikipedia.org
She passed on marble and granite in exchange for quartz and glass tile.
From the sfgate.com
Traditional quartz-based soda-lime glass also functions in many of the same roles.
From the en.wikipedia.org
The film is laid upon quartz or glass to create what's known as a photomask that is similar to a picture negative.
From the timesunion.com
He also considered quartz composite and recycled glass in concrete.
From the dispatch.com
Good wettability of glass, quartz, and many ceramics.