This standard specifies the general test method for the determination of the soluble matter content of pigment samples in boiling water. GB/T 5211.1 stipulates the method for determining the content of soluble matter in cold water by cold extraction method. For most pigments and extenders, these two test methods will give different test results, so the method used should be clearly indicated in the technical requirements, and the method used should be indicated in the test report. NOTE: This method is generally applicable to any pigment and extender. Reference should therefore be made to this method standard in the product standard for pigments or extenders and any detailed changes required due to the nature of the material should be noted. A different method is specified for the determination of 7k solubles only if this general method is not applicable to a particular material.
GB/T 5211.2-2003 history
2003GB/T 5211.2-2003 Determination of matter soluble in water of pigments hot extraction method
1985GB/T 5211.2-1985 Determination of water-soluble matter of pigments--Hot extraction method