Wollastonite is a calcium magnesium silicate. Wollastonite compositions can be formulated with 20 to 40 percent porosity. This variable porosity adjusts the overall strength versus thermal shock. Wollastonite is also inert to alkali and glaze vapor attack below 1,850° F. Wollastonite is most often used for kiln furniture.
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Wollastonite Properties
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Units
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ACT 600
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Material |
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Wollastonite
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General Application |
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Porous Refractories, Kiln Furniture & Supports for Glazing Ceramics
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Color (Fired) |
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Tan/Brown
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Porosity |
%
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20-40
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Density |
gm/cm3
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2.7-2.9
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Flexural Strength |
psi
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10,000-18,000
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Comprehensive Strength |
psi
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30,000-45,000
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Tensile Strength |
psi
|
-
|
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Linear Coefficient of Thermal Expansion |
(cm/cm/°C)
25-300°C
25-700°C
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11.0 X 10-6
11.8 X 10-6
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Dielecctric Constant at 25°C |
1 MH
10 MH
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3.0
4.0
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Dielectric Strength |
Volt/mil
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150
|
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Te Value |
°F
°C
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750
400
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Thermal Conductivity at 25°C |
cal/sec/cm2/cm/°C
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0.002
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Thermal Shock |
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Good
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Safe Use
Temperature |
°F
°C
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2200-2400
1200-1315
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Above values are test specimen results and actual shapes may vary in value.
We can work with other formulations as well.
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