Caltalc

Description: California talc

Oxide	Analysis	Formula
CaO	5.88%	0.13
MgO	27.66%	0.87
Al2O3	1.11%	0.01
SiO2	57.95%	1.22
Fe2O3	0.61%	-
LOI	6.80%	n/a
Oxide Weight		117.81
Formula Weight		126.41

Notes

CalTalcs are high purity, high brightness materials characterized by a platy grain shape and closely controlled particle size. They are excellent for use in a wide variety of products including ceramics, paint, coatings, paper, plastic, putty/joint compounds and rubber products. CalTalcs emcompass a series of products ranging from 200 mesh to 3 microns.

Grade 200 325 Micro MicroPlus

Specific Gravity: 2.75
Weight per solid Gal-lb: 23.3
Loose density lb/ft3 29 28 16 12
Tapped density lb/ft3 62 57 40 27
Plus 325 mesh 14% 1% trace NIL
Dry Brightness 88 88 90 90
Oil Absorption 20 28 33 36
pH: 9.2
Hegman Fineness 3 4+ 6

California Talc has been preferred by West Coast ceramists for many years and is noted for its light color, bright white firing, and the platty nature of its particles which create a silky greenware.

Related Information

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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.
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?

By Tony Hansen
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