Sierralite Talc

Alternate Names: Sierralite 252HS

Description: Chlorite

Oxide	Analysis	Formula
SiO2	32.00%	0.63
MgO	34.00%	1.00
Al2O3	21.00%	0.24
CaO	0.04%	-
Fe2O3	0.23%	-
LOI	12.60%	n/a
Oxide Weight		103.35
Formula Weight		118.25

Notes

This is 95% chlorite, less than 5% talc, less than 1% quartz. High alumina content (21%) and low iron oxide content. Useful in ceramics and refractory materials requiring low thermal expansion and good thermal shock resistance. They claim it "disperses easily in waterborne coatings and produces a low viscosity in solvent-borne coatings".

This could be a viable substitute for C-98 Texas talc from a physical properties standpoint. However it targets a market that can tolerate much higher costs, so the its very high price could disqualify it for you.

Related Information

Links

Materials	Talc A source of MgO for ceramic glazes, a flux or thermal expansion additive in clay bodies, also used in the manufacture of cordierite.
Materials	Silverline 303 Talc
Materials	Steatite
Materials	Natural Talc C-98
Typecodes	Flux Source Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
Hazards	Talc Hazards Overview Talc is invaluable in the ceramics industry, it is used as a glaze and body ingredient and as a parting a release agent in various processes. Is it safe?
URLs	https://www.imcdus.com/en-us/products/sierralite-252hs Sierralite 252hs Talc information
URLs	https://digitalfire.com/4sight/datahsheets/Sierralite 252HS.pdf Sierralite 252hs Talc data sheet

Data

GE Brightness	92
Density (Specific Gravity)	2.64
pH for dry powder	8.5
% Passing 200 Mesh Wet	99.8%

By Tony Hansen
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