Leachable Ceramic Silica / Zircon / Alumina SiO2 50 / ZrSiO4 40 / Al2O3 10 - Supplier Data by Goodfellow

This form of leachable ceramic is used in the precision foundry industry. The tubes and rods are incorporated into moulds in the lost wax process.

Using this technique, very fine tolerances on diameter can be obtained. The ceramic is leached away by the using sodium hydroxide solution once the metal has solidified.

This leachable ceramic has a high porosity, does not have an organic binder, but does absorb water.

Key Properties

The key properties of leachable ceramic are tabulated below.

Table 1. Key properties

Chemical Resistance
Acids - concentrated Fair
Acids - dilute Fair
Alkalis Poor
Halogens Fair
Metals Good
Physical Properties
Apparent porosity ( % ) 25
Density ( g.cm-3 ) 2.1
Water absorption - saturation ( % ) 14
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 1.98 @ 20-1000 °C
Upper continuous use temperature (°C ) 1050

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Goodfellow supplies metals, ceramics and other materials to meet the research, development and specialist production requirements of science and industry worldwide.

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