This test method covers the determination of calcium sulfate in gypsum and gypsum products by extraction with ammonium acetate solution.

1.1 These test methods cover the chemical analysis of gypsum and gypsum products, including gypsum ready-mixed plaster, gypsum wood-fibered plaster and gypsum concrete.

1.2 The test methods appear in the following order:

	Sections
Alternative Procedure for Analysis for Calcium Sulfate by Ammonium Acetate Method	17-22
Alternative Procedure for Analysis for Sodium Chloride by the Coulometric Method	23-29
Complete Procedure	5-16
Determination of Sand in Set Plaster	30-36
Optional Procedure for Analysis for Sodium by Flame Photometry	47-54
Optional Procedure for Analysis for Sodium by the Atomic Absorption Method	40-46
Preparation of Sample	4
Wood-Fiber Content in Wood-Fiber Gypsum Plaster	37-39

1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

1.4 The values stated in SI units are to be regarded as the standard.

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 and health practices and determine the applicability of regulatory limitations prior to use.