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Frequently Asked Questions

Infrasil 301 and 302 are optical quartz glass grades manufactured by fusion of natural quartz crystals in an electrically heated furnace that combine excellent physical properties with very good optical characteristics especially in the IR and the visible wavelength range.

Suprasil 300 is a high purity synthetic fused silica material manufactured by flame hydrolysis that combines excellent physical properties with outstanding optical characteristics from the UV to the near IR.

The chlorine content of Suprasil 300 is material inherent and ranges from 1000 ppm to 3000 ppm, resulting in a slight shift of the UV-absorption edge to the longer wavelength region.

The Suprasil 300 family of materials has ultra-low total metal impurities and low OH that result in no absorption bands from the visible to the IR spectral region, making it the ideal choice for any low absorption application in the near-IR.

During the manufacturing process, an intermediate drying step reduces the OH content of the Suprasil 300 to below 1 ppm.

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