This standard equivalently adopts ISO 787/5-1980 and specifies the method for determining the oil absorption of pigments. Oil adsorption refers to the amount of refined linseed oil absorbed by pigments under specific conditions, expressed as volume/mass or mass/mass. The standard provides detailed information on the reagents and instruments required to ensure the accuracy and conformity of the test process. If the general method does not apply to a particular product, a specific method should be developed.