Fused Quartz Labware: Quartz Scientific, Inc. Search Our Product Catalog : By Part Number By Keyword Quartz Scientific, Inc., is one of the nation's leading manufacturers of high quality, state of the art clear fused quartz products for a wide range of laboratory uses. QSI products are manufactured from high purity clear fused quartz. Many of the production processes at QSI involve the use of proprietary production equipment engineered to QSI specifications. QSI fabricates special clear fused quartz products and configurations to customer specification and repairs existing clear fused quartz p