These test methods cover procedures for the chemical analysis of red lead having the approximate formula Pb₃O₄ (probably PbO₂·2PbO). The pigment sample shall be ground to fine powder (if lumpy or not finely ground) and shall be thoroughly mixed before taking portions for analysis. Reagent grade chemicals shall be used in all tests. The methods of determining moisture, organic coloring matter, and total lead and insoluble matter contents are given. The solutions required for the chemical analysis of lead peroxide (lead dioxide) and true red lead (tetra lead oxide) includes red lead solution, sodium thiosulfate solution, and starch solution. The formula for calculating the contents of lead peroxide and true red lead, and the procedures for determining the amounts of zinc, matter soluble in water, total silica, carbon dioxide, soluble sulfates, and iron oxide are detailed.

1.1 These test methods cover procedures for the chemical analysis of red lead having the approximate formula Pb₃O₄ (probably PbO₂·2PbO).

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.