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Technology Stocks : General Lithography

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To: James Word who wrote (734)	1/1/1998 12:26:00 PM
From: Ian@SI	of 1305

JW, Yes the german company is Heraeus. I believe they have a sub or joint venture called Heraeus Amersil. SEE: besoptics.com Fused silica and fused quartz are used to manufacture products such as optical windows, precision optical flats, uv transmitting windows and laser optics of all types. Many people use the terms fused silica and fused quartz as one in the same but there is a distinction. Fused quartz is a mineralogical product mined from the earth as natural quartz or from quartzite sand. It is then manufactured by fusing powdered crystal quartz in a hydrogen-oxygen flame and selected to different purity specifications set by the manufacturers. Fused silica is a synthetic amorphous silicon dioxide that is produced using either flame or vapor phase hydrolosis of silicon halide. The result is an amorphous optical material of extremely high purity, and is one of the most tranparent optical materials made, which makes it more the choice for use in the far ultraviolet.

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