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New York talc has been mined around Gouverneur, New York since 1870. The area around the town is very rich in minerals, especially talc, a wide range of talcs can be found within a small area. Amazingly the material is no longer available (it has been plagued by controversy about whether or not it contains asbestos and whether the talc itself is a hazardous fibrous aluminum silicate like asbestos).
The RT Vanderbilt website recommends VanTalc (from Montana) as a substitute however its chemistry is quite different (it has almost no CaO (closer to theoretical which has zero CaO) and its iron content is much higher).
Nytal 99 and Ceramitalc HDT are pressing grades of talc for use in ceramic wall tile and artware. They have been standards in the ceramic industry for many years because of their white firing, reliability and wide deflocculation curve. They are "certifiable" for non-toxic purposes in an ever growing health conscious market. Both products develop high uniform thermal expansion and low moisture expansion to prevent crazing in bodies that can be safely fired at rapid cycles. Nytal 99 produces bodies with somewhat lower shrinkage than Ceramitalc HDT, otherwise they are similar.
Nytal 100 is used as an auxiliary flux in vitreous bodies such as electrical porcelain and sanitaryware. Recommended for cordierite development in refractory specialties, and to impart strength and resistance to delayed crazing in semivitreous dinnerware. Nytal 100HR and Ceramitalc 10AC have special use in art pottery and hobby casting slips. All three grades perform well in dry pressing, ram-pressing and in the making of good casting slips.
Nytal is offered in various particle sizes. White talcs are usually thought of as soft materials, but this contains an appreciable amount of other silicate minerals which can be somewhat abrasive.
Density Mg/m3 2.85
pH at 10% solids 9.4
Abrasiveness (Einlehner M/M2 loss, 174,000 revolutions) 175-300
Out Bound Links
Magnesium Silicate, Steatite, French Chalk, Hydrated talc
Hazards of this material in the ceramic industry and process