|Monthly Tech-Tip |
Alternate Names: Sierralite 252HS
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.
|Materials||Silverline 303 Talc|
|Materials||Natural Talc C-98|
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.
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?
Sierralite 252hs Talc information
Sierralite 252hs Talc data sheet
|Density (Specific Gravity)||2.64|
|pH for dry powder||8.5|
|% Passing 200 Mesh Wet||99.8%|