Digitalfire Ceramic Materials Database

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Alkatrol

Andalusite/pyrophyllite/sericite

Chemistry %

K2O	1.30
Na2O	1.30
TiO2	0.50
Al2O3	21.00
SiO2	73.10
Fe2O3	0.40

Volatiles %

LOI

2.50

DENS - Density (Specific Gravity)

2.60

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.

Mechanisms

Body Maturity - Mullite Formation
Assists in the formation of mullite at lower temperatures than formed by conventional alumina-silica sources.
Body Plasticity - Extrusion
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.

Out Bound Links

(Materials - Related) Pyrotrol - Andalusite/Pyrophyllite Ore
(Materials) Seriphyl
(Materials - Parent) Andalusite - Al2O3.SiO2
Chiastolite
(Materials - Parent) Pyrophyllite - Al2O3.4SiO2.H2O - A Soft Hydrous Aluminum Silicate
Pyrophillite
(Materials - Name Brand of) Alkatrol W-22535
(Materials - Name Brand of) Alkatrol W-20031
(Materials - Name Brand of) Alkatrol G-20041
(Typecodes) 1: ALS - Aluminum Silicate
(MDT) Ron Roy
This is the traditional Ron Roy materials file. He...
(MDT) North America
The decision about what materials to include in th...

In Bound Links

(Materials - Related) Pyrofrac - Pyrophyllite/Andalusite
(Materials - Related) Andafrac - Andalusite/pyrophyllite
(Materials - Related) Pyrofrac 0204
(Materials - Related) Pyrofrac 0304
(Materials - Related) Pyrofrac 1004
(Materials - Related) Pyrofrac 1655
(Materials - Related) Pyrofrac 1855
(Materials - Related) Pyrofrac 2023
(Materials - Related) Pyrofrac 2024
(Materials - Related) Pyrofrac 2034
(Materials - Related) Pyrofrac 4203
(Materials - Related) Pyrofrac 4205
(Materials - Related) Pyrophyl - Pyrophyllite

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?>
<material name="Alkatrol" descrip="Andalusite/pyrophyllite/sericite" searchkey="" loi="0.00" casnumber="12269-78-2">
<oxides>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="1.300" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="1.300" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.500" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="21.000" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="73.100" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.400" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="LOI" name="Loss on Ignition" percent="2.500" tolerance=""/>
</volatiles>
</material>