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Bureau of Mines / Minerals yearbook: Metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)

Wells, J. Robert
Talc, soapstone and pyrophyllite,   pp. 1191-1199 ff. PDF (988.5 KB)


Page 1199

TALC, SOAPSTONE, AND PYROPHYLLITE 
1199 
 A patent was gran1~ed for a process in which *talc, clay, feldspar, wollastonite,
or other ceramic materials are combined in an aqueous mixture with an approximately
equal quantity of exfoliated vermiculite, and that mixture is pressed into
shapes that are then dried, fired, and glazed to produce strong and lightweight
disposable containers.15 In a process for which a patent was granted, an
aqueous dispersion of pyrophyllite is applied to one surface of a paper form,
after which the object is 
dried, coated with a glazing material, and fired to vitrify the glaze and
consume the combustible base, thus producing inexpensive, thin-walled ceramic
ware to be discarded after a single use.'6 
 "Hardy, P. W., and 0. M. Peterson (assigned to American Can Co.). Method
of Making Glazed Ceramic Bonded Expanded Vermiculite Articles. U.S. Pat.
3,689,611, Sept. 5, 1972. 
' °Simmen, F. G. (assigned to Hall China Co.). 
Manufacture of Disposable Ceramic Dishes From 
High-Alkali Pyrophyllite. U.S. Pat. 3,655,843, Apr. 
11, 1972. 


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