Alkatrol

Description: Andalusite/pyrophyllite/sericite

Oxide	Analysis	Formula
TiO2	0.50%	0.03
Al2O3	21.00%	1.00
SiO2	73.10%	5.91
Fe2O3	0.40%	0.01
Na2O	1.30%	0.10
K2O	1.30%	0.07
LOI	2.50%	n/a
Oxide Weight		474.06
Formula Weight		486.21

Notes

Sericite is blended with andalusite/pyrophyllite ore to lower the PCE and produce the Alkatrol series of products. These are added to wall and floor tile to increase fired strength, in stoneware, structural ceramics, coatings, and whiteware ceramics to improve whiteness, widen firing range, reduce warpage, increase thermal shock resistance, and stabilize shrinkage.

This material is manufactured by crushing & screening and dry milling of selectively mined andalusite/pyrophyllite/sericite ores.

Individual alkatrol variations have different chemistries, the one shown here is an average.

Related Information

Links

Materials	Andafrac
Materials	Pyrofrac 0204
Materials	Pyrofrac 0304
Materials	Pyrofrac 1004
Materials	Pyrofrac 1655
Materials	Pyrofrac 1855
Materials	Pyrofrac 2023
Materials	Pyrofrac 2024
Materials	Pyrofrac 2034
Materials	Pyrofrac 4203
Materials	Pyrofrac 4205
Materials	Pyrotrol
Materials	Pyrofrac
Materials	Pyrophyl
Materials	Andalusite
Materials	Pyrophyllite
Materials	Alkatrol G-20041
Materials	Alkatrol W-20031
Materials	Alkatrol W-22535
Materials	Seriphyl
Typecodes	Aluminum Silicate Materials not classifiable as commonly known aluminum silicates. For example, kaolin is a common aluminum silicate.

Data

Density (Specific Gravity)	2.60
Dry M.O.R. (50% Silica)	398C

Mechanisms

Body Maturity	Assists in the formation of mullite at lower temperatures than formed by conventional alumina-silica sources.
Body Plasticity	Moderately high percentages of the Alkatrol products can be substituted in body compositions to reduce laminations in pressing and to aid in extrusion.
Body Thermal Expansion	Add this to reduce thermal expansion and reduce firing shrinkage.

By Tony Hansen
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