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Aluminum silicate fiber board is a high-temperature insulation material used in kilns, boilers and high-temperature pipes. The quality should be tested for density, thermal conductivity and heating shrinkage.
The bulk density is measured by the weight and volume of the sample. It should be within the range specified in the product standard to ensure both strength and thermal insulation performance.
Thermal conductivity at high temperature is tested with the flat plate method. The value should be low enough to meet the design requirement of the high-temperature insulation system.
Heating shrinkage is an important index. The sample is heated to the rated temperature for a specified time, and the linear shrinkage is measured. Excessive shrinkage will cause gaps in the insulation layer.
The surface should be smooth and uniform in fiber distribution, without lumps or obvious thickness difference. The product label should indicate the temperature grade and specification.
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