ASTM International - ASTM D1844-86(2020)
Standard Test Methods for Chemical Analysis of Basic Lead Silicochromate
|Publication Date:||1 June 2020|
|ICS Code (Pigments and extenders):||87.060.10|
significance And Use:
3.1 These test methods may be used to confirm the stated lead oxide, chromium trioxide and silica content of basic lead silicochromate and is useful for quality control.
1.1 These test methods cover the chemical analysis of the pigment commercially known as basic lead silicochromate and are applicable to pigment supplied by the manufacturer and to pigment, but not mixed pigments, separated from liquid coatings. The presence of basic lead silicochromate species shall be confirmed by X-ray diffraction analysis (see Specification D1648).
1.2 For liquid coatings the pigment must first be separated from the vehicle before conducting the analysis.
1.3 The analytical procedures appear in the following order:
|Lead oxide||6 to 14|
|Chromium trioxide||15 to 23|
|Silica||24 to 27|
|Moisture and other volatile matter||28|
|Mass color and tinting strength||31|
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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.
1.6 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.