ISO 1598:1990

Plastics – Cellulose acetate — Determination of insoluble particles

Specifies a test method for determinig the number of insoluble and visible particles including all impurties and foreign particles in cellulose acetate. A test portion is dissolved in a mixture of dichloromethane, methanol and dimethylphthalate. Counting of all visible particles with a diameter greater than 0,15 mm in a square area with a side length of 25 mm.