Reference number
ISO 1391-4:1976
ISO 1391-4:1976
© ISO 2024
ISO 1391-4:1976
Paraformaldehyde for industrial use — Methods of test — Part 4: Determination of water-insoluble matter
Edition 1
1976-12
1976-12
Withdrawn
Abstract
The principle of the procedure consists in the dissolution of a test sample in a highly diluted sodium hydroxide solution, filtration by using a tared filter crucible, drying of the residue at (100 2) °C. Determination of the in water insoluble substances by differences. - ISO 1391, Parts 1 to 4, replace ISO Recommendation R 1391-1970.