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Pioneer 2661 Talc

Alternate Names: Pioneer Ceramic Talc, Pioneer Talc, Pioneer 2882

Oxide Analysis Formula
CaO 3.50% 0.08
MgO 29.50% 0.92
Al2O3 0.50% 0.01
SiO2 53.50% 1.12
Fe2O3 0.50% 0.00
TiO2 0.10% 0.00
K2O 0.30% 0.00
Oxide Weight 110.21
Formula Weight 123.83


Now called AmTalc
Texas Talc has a darker grey raw color and a rounder fluffier particle than other talcs. However it fires very white and is desired for its consistency. It is commonly used in ceramic slurries for low temperature greenware. Pioneer talcs are non-asbestiform.

Various grades are available.

Acid Solubles: 2-4
pH: 9.5
LOI: 11.5
Water Solubles: -.1
Dry Brightness: 58-65
Dry Brightness after firing: 88+
Specific gravity: 2.7
Tapped Density: 75-85 lbs/ft3
Loose Density: 35-45 "
One Lb. Bulks, Gallons: .04
Shrinkage: 0.60
Oil Absorption: 32
Hegman Fineness: 1.0

Thru 200 mesh, %: 97.0
Thru 325 mesh, %: 85.0
Median Particle Size: 19.0 microns

2882 Talc is the same except:
Fe2O3: < .69
Dry Brightness: 62.0

Pioneer 1599 is a platy Texas general purpose industrial talc.

Related Information

Permeability demonstration of Texas and Montana talcs

Texas talc (left) quickly absorbs all the water poured on it. Montana talc (right) resists whetting of the particles much more, the water is just sitting on top and has not penetrated at all.

Texas talc (left) and Montana talc (right)

Texas talc contains some amorphous carbon. The carbon is not stand-alone, but as CO2 in the dolomitic part of the ore. It produces 7% LOI between 750-850C. Even though the color is so much darker in the raw form, it fires whiter!


Product Information
Replace Talc with Nepheline Syenite in low temperature white bodies
This is a development project at Plainsman Clays. It is in response to Texas talc no longer being available in North America.
Hazards Talc Toxicology
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?
Materials Amtalc-C98
Materials Talc
Materials Suzorite 325-PE
Materials Desertalc
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.

By Tony Hansen

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