This part of ISO 787 specifies a general method of test for comparing the lightening (reducing) power of a white pigment with the lightening power of an agreed sample of the same type. Two procedures (A and B) are described. Procedure A is quicker than procedure B and is suitable for testing one sample of pigment; procedure B is better for testing several samples@ and especially if a pigment of unknown lightening power is being tested. NOTE When this general method is applicable to a given pigment@ a cross-reference to it will simply be included in the International Standard relating to that pigment@ with a note of any detailed modification which may be needed in view of the special properties of the pigment in question. Only when this general method is not applicable to a particular pigment will a special method for comparison of lightening power of white pigments be specified.
EN ISO 787-17:2017 history
2019EN ISO 787-17:2019 General methods of test for pigments and extenders - Part 17: Comparison of lightening power of white pigments
2017EN ISO 787-17:2017 General methods of test for pigments and extenders - Part 17: Comparison of lightening power of white pigments