ASTM D476:15(R2021) pdf free download – Standard Classification for Dry Pigmentary Titanium Dioxide Products.
It is limited to dry, hiding pigments. It excludes pigment dispersions, and non-hiding specialty titanium dioxide products.
4. Basis for Classification
4.1 Titanium dioxide pigments can differ in many ways. including composition and performance. This classification outlines differences between pigment types that should be considered when selecting a product for a coating application. A minimum number of properties are given to highlight major differences, while allowing maximum flexibility.
5. Composition and Properties
5. 1 Titanium Dioxide Pigments, should conform to the requirements for composition prescribed in Table 1. They are chemically prepared pigments consisting of analase or rutile titanium dioxide with or without modifications with waterinsoluble oxides of aluminum, silicon, zinc, etc., or other agents; these reagent materials are introduced specifically to improve those properties for which the pigment is used. The titanium dioxide pigments shall be free of extenders such as barium sulfate, clay, magnesium silicate, whiting. etc.
5.2 The desired properties of the pigment, other than as herein indicated, shall be subject to agreement between the purchaser and the seller and shall he based on a satisfactory match between the submitted pigment sample and a previously agreed upon reference sample (see 6. 1.6).