- ADM Lecithin
- Advanced Vacuum Systems
- Aerospace Coating Systems, Inc.
- Aluminium Pechiney
- American Chemet Corp.
- American Minerals, Inc.
- American Minerals, Inc.
- Amplex
- Applied Test Systems
- Arlington International
- B.E.S.T. Inc.
- Beckman Coulter
- Bluebird Manufacturing, Inc.
- Business Communications Co.
- Carbolite Inc.
- Centorr/Vacuum Industries
- Ceradyne Inc.
- Ceramic Color & Chemical Mfg. Co.
- CerMA
- Chand Kare Technical Ceramics
- Clayworld
- Columbus Precision Tool
- CoorsTek
- Cress Manufacturing Co. Inc.
- Cyclonaire Corp
- Danser Inc.
- Deltech Inc.
- Design Point Decal, Inc.
- Diacut Inc.
- Diamond Productions
- Drayton Kilns Ltd
- Eagle Zinc Co.
- Eisenmann Corp
- Electro Abrasives
- Elkem ASA Materials
- Engelhard
- Engineered Ceramics
- ESK (Wacker Engineered Ceramics)
- Ferro Corp.
- Flow Autoclave Systems Inc.
- Fosbel Inc. /Hotwork
- Frantz, S.G. Co., Inc.
- Fraser Papers
- Fuse Tech Inc.
- Fylograf
- GE Micron Products
- General Spray Drying Service Inc.
- G-P Gypsum
- Grieve Corp.
- Haake (Cahn)
- HammerTek Corp.
- Hammill & Gillespie Inc.
- Hammill & Gillespie Inc.
- Hanco International
- Harrop Industries Inc.
- Hauck Manufacturing Co.
- Hi-Vac Corp.
- I Squared R Element Co., Inc.
- Industrial Furnace Supply
- Ingredient Masters
- Instar Enterprises Intl. Inc.
- International Technical Ceramics Inc.
- Ipsen Ceramics
- James Instruments
- Jayne Industries Inc.
- Jyoti Ceramic Industries (Pvt) Ltd.
- Kanthal Corp., The
- Keith Company, Inc.
- Keith Company, Inc.
- Kercher Industries Inc.
- Kil-Tel Systems Inc.
- L & L Special Furnace
- Lafarge Aluminates Intl.
- Laguna Clay Co.
- Lands Superabrasives
- Lemmens, J.W., Inc.
- Lex Kiln Industries
- LignoTech USA
- Lindberg
- Lunzer Inc.
- Magneco/Metrel
- Martin Marietta Magnesia Specialties
- Mason Color Works Inc.
- Materials Research Furnaces Inc.
- Mathis Instruments Ltd.
- Micromeritics Instrument Corp.
- Micropyretics Heaters Intl., Inc. (MHI)
- Midwestern Industries Inc.
- Munson Machinery Co. Inc.
- Nabertherm GmbH
- Nanchuan Minerals Group Co. Ltd.
- Nanshu Graphite Corp.
- National Boraxx Corp.
- Netzsch Inc.
- New Castle Refractories Co.
- Niro
- North American Mfg.
- Novel Technologies
- Oglebay Norton Industrial Sands
- OMG
- Orton Ceramic Foundation
- Orton Ceramic Foundation
- Oxy-Gon
- Pacific Industrial Development C
- Permascand AB
- Poco Graphite
- Porous Materials Inc.
- Pred Materials
- Prince Mfg
- Procedair
- PTG
- PTX Pentronix
- Pyrotek
- Rauschert Technical Ceramics
- Resco Products
- Reynolds Metals
- Rheometric Scientific
- Riedhammer
- Rio Tinto I&T America
- Rohm & Haas Advanced Material
- Roufs Machine Co
- Saint-Gobain Norton
- Seaforth Minerals
- SEPR Ceramic Beads & Powders
- Shenango Refractories
- Solartron
- Sp3
- Superior Graphite
- Thermal Ceramics
- Thuringia Netzsch GmbH
- Tosoh Corp.
- Tullis Russell Inc.
- UK Abrasives
- Unifrax Corporation
- Unimin
- Unique/Pereny
- United States Gypsum
- Universal Minerals
- US Electrofused Minerals
- US Silica
- US Stoneware
- Vac-U-Max
- Vanderbilt, R.T.
- Vector Technologies
- Viox
- Washington Mills
- Watts Blake Bearne
- Western Claymachinery Sales
- Wyssmont
- Zemex
- Zirconia Sales
- Z-Tech


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