This standard is applicable to the determination of the appearance and transparency of varnishes, varnishes, paints and thinners, that is, whether they contain mechanical impurities and the degree of turbidity.
GB/T 1721-1979 history
2008GB/T 1721-2008 Determination of appearance and transparency of varnishes,boiled oils and thinners
1979GB/T 1721-1979 Methods of test for appearance and transparency of varnishes,boiled oils and thinners