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Pyrax Pyrophyllite


Oxide Weight614.60
Formula Weight634.26
If this formula is not unified correctly please contact us.

Pyrax is chemically similar to a clay, it is a hyrated aluminum silicate. But Pyrax has the appearance of a talc. Many properties of Pyrax are quite similar to talcs. Pyrax has a neutral pH and due to the presence of quartz, is highly abrasive.

Density Mg/m3 2.8
pH at 10% solids 6.9
Abrasiveness (Einlehner M/M2 loss, 174,000 revolutions) 450-500

Pyrax is available as types A, B and WA. They vary in particle size and thus bulk density and color.

-325# -10micron -5micron -2.5micron
Pyrax A 90 50 28 13
Pyrax B 95 50 27 11
Pyrax WG 87 44 28 15

Pyrax HS Used mainly in wall tile bodies, especially fast-fire. It lowers firing temperature; produces low moisture expansion bodies; increases thermal shock resistance; and greatly increases firing strength of vitreous bodies. It promotes the development of mullite when substituted for an equivalent amount of feldspar or quartz.

Pyrax RG Refractory grade used in insulating firebrick, metal pouring refractories, ramming mixes, gunning mixes, castable mixes and kiln car refractories.

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In Bound Links

By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Pyrax Pyrophyllite" descrip="PYRAX (TYPES A, B, WA)" searchkey="" loi="0.00" casnumber="12269-78-2"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.100" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.100" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="1.810" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="0.300" tolerance=""/> <oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.100" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="16.080" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="78.200" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.200" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="3.100" tolerance=""/> </volatiles> </material>

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