Specifies the laboratory sample to have a mass of not less than 500 g. Before carrying out the tests, the sample shall be grind to a fine powder and mixed thoroughly. - ISO 1391, Parts 1 to 4, replace ISO Recommendation R 1391-1970.
ISO 1391-1:1976 history
1970ISO 1391-1:1976/Cor 1:1977 Test methods for paraformaldehyde for industrial use Part 1: General Technical Corrigendum 1
1976ISO 1391-1:1976 Paraformaldehyde for industrial use; Methods of test; Part 1 : General