ASTM C471M-20ae1 PDF Download

ASTM C471M-20ae1 is a standard that provides test methods for the chemical analysis of gypsum and gypsum products, specifically in metric units. The standard covers various types of gypsum products, including gypsum ready-mixed plaster, gypsum wood-fibered plaster, and gypsum concrete.

The test methods outlined in the standard are presented in a specific order. This includes the preparation of the sample, the complete procedures for analysis, alternative procedures for analyzing free water and combined water in gypsum using a moisture balance, analysis of organic material and carbon dioxide in gypsum using high temperature weight loss, analysis for calcium sulfate using the ammonium acetate method, analysis for sodium chloride using the coulometric method, determination of sand in set plaster, wood-fiber content in wood-fiber gypsum plaster, analysis for sodium using the atomic absorption method or flame photometry, determination of orthorhombic cyclooctasulfur (S8) in gypsum panel products using gas chromatograph equipped with a mass spectrometer (GS/MS), gas chromatograph equipped with an electron capture detector (GC/ECD), or high-performance liquid chromatograph equipped with an ultraviolet detector (HPLC/UV).

The standard also includes explanatory notes and footnotes that provide additional information and clarification. It is important to note that these notes and footnotes, excluding those in tables and figures, are not considered requirements of the standard.