The Tosoh Quartz Group is a global supplier of natural and synthetic fused quartz and fused silica, commonly referred to as Quartz. Tosoh Corporation, Tosoh SGM Corporation and Tosoh SGM USA, Inc. supply a wide variety of different shapes and sizes. The main N grade is excelling in its low bubble content, while the OP grade opaque (non-transparent) quartz material is recognized as unique in its field. Materials Description N Fused from the internationally recognized lOTA powder with oxy-hydrogen flames, resulting in low bubble content. A high-purity "NP" grade and a window-specific "OZ" grade are also available. OP Fused opaque quartz has excellent IR heat blocking characteristics. A tight distribution of very small bubbles produces a dense pure-white opaque material and subsequently excellent achievable surface finishes. OP fused from a higher-purity raw material is also available. Synthetic A high-grade synthetic silica "ES" grade with virtually no bubbles or inclusions, extreme high-purity, and excellent ultraviolet transmission. The "ED" grade manufactured by VAD process and a low-OH type variation called "ED-C" are also available.

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