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Established 1949. Manufacture and export refractories in basic, high-alumina, silica refractories (especially coke-oven dense silica brick), slide gate refractories, magnesia-carbon brick, castables, C.C. refractories, gunning mix and spray materials, and portland and slag cement. R&D labs available.

Established 1918. Specialize in ball clays for dinnerware, refractories, sanitaryware, tile, porcelain, glazes and other ceramics manufacturing. Clay products available in air-floated, shredded, mechanically dried and slurry forms. Mine, mill and processing plants at Hickory, Ky., and Gleason, Tenn. Headquarters and complete ceramics lab at Hickory, Ky. ISO 9001:2000 certified.

Produce various grades of whole grain and ground silica for use in the glass, whiteware, enameling and ceramic powder industries. Plants in Ohio, Texas and California.

Produce glass and plastic packaging systems for the food, beverage and pharmaceutical industries for commercial and retail use. Consulting/purchasing agreements available for technical assistance to noncompetitive glass producers and users.

Offer a range of materials-characterization capabilities, including electron microscopy, microchemical characterization and crystal structure analysis by X-rays and neutrons. Perform mechanical and thermophysical property measurement as well as wear testing and advanced grinding evaluations.

Offer variety of analytical techniques to maintain and improve the quality of electronic components, printed circuit boards and ceramics packaging. Services include internal vapor analysis, optical adhesive qualification, outgassing/impurities, identification, failure analysis, surface analysis and material characterization. Analytical instrumentation includes IVA/RGA, ICP/MS, FTIR, GC/MS, C-SAM, FeSEM, SEM/EDS, Auger, and real time X-ray.

Manufacture lighting worldwide. Member of the Siemens international family of companies.

Provide plants, equipment and services based mainly on its proprietary technologies. In-house-developed HSC chemistry software simulates chemical reactions and processes on a thermochemical basis.