Wollastonite

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.

Wollastonite Properties
Units
ACT 600
Material
 
Wollastonite
General Application
 
Porous Refractories, Kiln Furniture & Supports for Glazing Ceramics
Color (Fired)
 
Tan/Brown
Porosity
%
20-40
Density
gm/cm3
2.7-2.9
Flexural Strength
psi
10,000-18,000
Comprehensive Strength
psi
30,000-45,000
Tensile Strength
psi
-
Linear Coefficient of Thermal Expansion
(cm/cm/°C)
25-300°C
25-700°C
11.0 X 10-6
11.8 X 10-6
Dielecctric Constant at 25°C
1 MH
10 MH
3.0
4.0
Dielectric Strength
Volt/mil
150
Te Value
°F
°C
750
400
Thermal Conductivity at 25°C
cal/sec/cm2/cm/°C
0.002
Thermal Shock
 
Good
Safe Use
Temperature
°F
°C
2200-2400
1200-1315

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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