Kaolin

Processing Technology

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Application of Kaolin powder

Paper Ceramic Rubber Paint and Coating

The primary use of kaolin is in the paper industry. It serves as a paper coating which improves appearance by contributing to brightness, smoothness and gloss. It also improves printability. Additionally, it is used by the paper industry as a filler reducing cost and the use of tree-based resources.

Kaolin Powder for Paper Making Industry Standard(GB/T14563-2008)

Item	ZT-0A	ZT-0B	ZT-1	ZT-2	ZT-3
Whiteness	≥ 88%	≥ 87%	≥ 85%	≥ 82%	≥ 80%
< 2μm Content	≥ 92%	≥ 85%	≥ 80%	≥ 75%	≥ 70%
45μm Residue Rate	≤0.005%	≤0.04%	≤0.04%	≤0.05%	≤0.05%
PH Value	≥ 4
Viscosity Concentration(500 mPa.S)	≥ 70%	≥ 66%	≥ 65%	≥ 65%	≥ 60%
LOI	≤15%
Al2O3	≥ 37%	≥ 37%	≥ 36%	≥ 35%	≥ 35%
Fe2O3	≤0.60%	≤0.60%	≤0.70%	≤0.70%	≤1.0%
SiO2	≤48%	≤48%	≤49%	≤50%	≤50%

Many people are under the mistaken impression that the only use for kaolin is in the manufacture of china. This is not true, and its use by the paper industry far exceeds its other uses. However, kaolin still serves as a valuable component in china and other tablewares. Its color, gloss and hardness are ideal characteristics for such products.

Kaolin Powder for Ceramic Industry Standard(GB/T14563-2008)

Item	TC-0	TC-1	TC-2	TC-3
1280℃ Burnt Whiteness	≥ 90%	≥ 88%	-	-
Residue Rate	≤1% (45μm)	≤1% (45μm)	≤1% (63μm)	≤1% (63μm)
Al2O3	≥ 35%	≥ 33%	≥ 32%	≥ 28%
Fe2O3	≤0.40%	≤0.60%	≤1.20%	≤1.80%
TiO2	≤0.10%	≤0.10%	≤0.40%	≤0.60%
SO3	≤0.20%	≤0.30%	≤0.80%	≤1.00%

The bonds between the kaolin and the polymers provide enhanced mechanical strength, improved impact and flex strength, and a high degree of hydrophobicity. Kaolin also acts as a titanium dioxide extender, which means less of the expensive additive is needed to yield sharper colors.
In rubber, kaolin performs as a processing aide, giving the material dependable curing rates and increased strength with better resistance to tears and abrasions.

Kaolin Powder for Rubber Industry Standard(GB/T14563-2008)

Item	XT-0	XT-1	XT-2
Whiteness	≥ 78%	≥ 65%	-
Moisture	≤1.5%
125μm Residue Rate	≤0.02%	≤0.02%	≤0.05%
PH Value	5.0~8.0
Diphenylhydrazine	6.0%-10.0%		6.0%-10.0%	4.0%-10.0%
sorption Rate
Mn	≤0.1%
Cu	≤0.005%

Kaolin also offers increased opacity and tint strength, stain and scrub resistance, improved pigment suspension, sheen control and improved holdout.

Kaolin Powder for Paint Industry Standard(GB/T14563-2008)

Item	TL-1	TL-2	TL-3
Whiteness	≥ 85%	≥ 82%	≥ 78%
45μm Residue Rate	≤0.05%	≤0.10%	≤0.20%
10μm Residue Rate	≤10%	≤20%	≤30%
PH Value	5.0~8.0
Al2O3	≥ 35%
SiO2	≤50%