Nytal Talc
Hydrous Magnesium Calcium Silicate
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
- (Materials - Parent)
Talc - Mg3Si4O6 or 3MgO.4SiO2.H2O
Magnesium Silicate, Steatite, French Chalk, Hydrated talc
- (Hazards)
Talc Hazards Overview
Hazards of this material in the ceramic industry a... - (Typecodes)
1: FLS - Flux Source
- (MDT - Member)
North America
The decision about what materials to include in th... - (MDT - Member)
Crystal Glazes
These materials are specially defined for makers o... - (MDT - Member)
Australia
We are working on this database and would apprecia... - (MDT - Member)
New Zealand
We are working on this database and would apprecia... - (Materials - Related)
VanTalc - Hydrous Magnesium Calcium Silicate
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Nytal Talc" descrip="Hydrous Magnesium Calcium Silicate" searchkey="" loi="0.00" casnumber="14807-96-6">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="U" percent="8.420" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="U" percent="30.000" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="U" percent="0.340" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="0.310" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="55.200" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.160" tolerance=""/>
<oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.170" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="LOI" name="Loss on Ignition" percent="5.410" tolerance=""/>
</volatiles>
</material> | 
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