Natural black talcum powder for ceramic usage with low iron 0.08%
CERAMICS GRADE TALC POWDER
Technical Data Sheet
Item number LMME-CRA
Aftere calcined Whiteness ≥93％
SiO2 ≥61％
MgO ≥31％
CaO ≤0.5％
Fe2O3 ≤0.1％
Al2O3 ≤0.2％
- ℃) ≤ 6％
ACID SOLUBLE CALCIUM ≤0.4％
Moisture ≤0.2％
Passing through (45µm) ≥98％
Ceramic grade talc powder used for manufacturing atomised clay to ceramic tile body and glaze, electro technical porcelain, all kind of industrial, building, daily-use ceramic glaze, waterproof roll, waterproof paint and waterproof balm etc. Feature: high whiteness&brightness and stability at high temperature, but low iron and loss on ignition to allowing the production of blends and bodies free of dark dots , improve workability and avoid cracks.
Product Description: Talc is increasingly being used in the manufacture of art wares, jars, wall and floor tiles. It serves as a non-plastic ceramic material. The addition of talc in suitable proportions in the body of mixtures for porcelain, jars etc. prevents the crazing (cracking) effect on the glazes. The proportion of talc in the ceramic body may go up to 80%. It is valued for its refractoriness and stability, as well as extremely law shrinkage at high temperature. Talc converts into clino-enstatite at about 1300º C. Between 800ºC to 840ºC, the water molecules are driven off and talc dissociates into enstatite and amorphous silica without undergoing any change in shape, the shrinkage being 0.0005 inch only.
In the manufacture of ceramic goods required for the electrical industry, the talc should not contain more than 1.5% FeO and CaO.Steatite suitable for the manufacture of 'lava' insulators must he dense, compact, uniform and homogeneous in texture, free from any inclusion and parting planes. It should not contain CaO more than 1.5% and Fe2O3; more than 1%. The iron oxide is a colorant and gives the fired shapes an unattractive color. An increase of iron oxide above two per cent decreases the 'Q' value (ratio of reactance to resistance) and increases the dielectric constant. CaO imparts abrasiveness and usually a short vitrification range and sometimes a high firing shrinkage.
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