Digitalfire Ceramic Materials Database

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Ultrafiber 55

WOLLASTONITE

Chemistry %

CaO	47.50
MgO	0.10
TiO2	0.02
Al2O3	0.20
SiO2	51.00
Fe2O3	0.40
MnO	0.10

Volatiles %

LOI

0.68

MLPT - Melting Point (MP)

1540 C

This is a coarser grade of needle-shaped crystal wollastonite that acts in a manner similar to fiber additions.
Adding 3-5% will reduce dry and firing shrinkage and improve impact resistance.
Screens to 60 mesh or coarser will accomodate re-screening. 1% retention of 100 mesh is normal.
Best to add to finished slip during gentle paddle mixing.
Polyacrylate thickeners might interfere with efficiency.

Effects on firing are minimal enough that Nyco recommends post additions.

Morphology: Acicular
Specific Gravity: 2.9
Refractive Index: 1.63
pH (19% slurry): 9.9
Water Solubility (g/100cc): 0.0095
Density (lbs/solid gallons): 24.2
Bulking value (gal/lbs): 0.0413
Mohs hardness: 4.5
Coefficient of expansion (mm/mm/C): 6.5 x 10-6
Median particle size (microns): 45
Minus 100 mesh (%): 97
Moisture (%): 0.01

Out Bound Links

(Typecodes) 1: AGT - Aggregate

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?>
<material name="Ultrafiber 55" descrip="WOLLASTONITE" searchkey="" loi="0.00" casnumber="">
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="47.500" tolerance=""/>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.100" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.020" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="0.200" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="51.000" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.400" tolerance=""/>
<oxide symbol="MnO" name="Manganous Oxide" status="" percent="0.100" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="LOI" name="Loss on Ignition" percent="0.680" tolerance=""/>
</volatiles>
</material>