The insoluble matter is generally considered to be acid-insoluble silica and silicates, carbides, alumina, and clays. The methods are applicable to lubricant-free powders. ISO 4496 specifies apparatus and reagents, sampling, procedure, expression of results and test report.
Life cycle
NOW
WITHDRAWN ISO 4496:1978 95.99
Withdrawal of Standard Jul 12, 2017