ISO 3340:1976 Preview
Fibre building boards -- Determination of sand content
This standard was last reviewed and confirmed in 2015. Therefore this version remains current.
The purpose of the method specified is to obtain an indication of machinability by cutting tools. The principle is based on the complete combustion of test pieces and weighing the sand remaining in the desiccator at the end of the procedure. The tubular hearth used to ignite the test pieces is shown in the figure.
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