---
title: "ASTM C471"
url: "https://mat-cs.com/astm-c471/"
description: "These test methods cover the chemical analysis of gypsum and gypsum panel products, including gypsum ready-mixed plaster, gypsum wood-fibered plaster, and gypsum concrete."
---

ASTM Standard

# ASTM C471

Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)

[Back to all techniques](/analytical-techniques/)

## Scope

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

1.2 These test methods appear in the following order:

Sections

Preparation of Sample

4

Complete Procedure

5 – 16

Alternative Procedure for Analysis of Free Water in

17

Gypsum Using a Moisture Balance

Alternative Procedure for Analysis of Combined Water in

18

Gypsum Using a Moisture Balance

Alternative Procedure for Analysis of Organic Material

19

and Carbon Dioxide in Gypsum by High Temperature

Weight Loss

Alternative Procedure for Analysis for Calcium Sulfate by

20

Ammonium Acetate Method

Alternative Procedure for Analysis for Sodium Chloride by

21

the Coulometric Method

Determination of Sand in Set Plaster

22

Wood-fiber Content in Wood-fiber Gypsum Plaster

23

Optional Procedure for Analysis for Sodium by the Atomic

24

Absorption Method

Optional Procedure for Analysis for Sodium by Flame

25

Photometry

Determination of Orthorhombic Cyclooctasulfur (S8) in

26

Ggypsum Panel Products—General Provisions

Determination of Orthorhombic Cyclooctasulfur (S8) in

27

Gypsum Panel Products by Gas Chromatograph

Equipped with a Mass Spectrometer (GS/MS)

Determination of Orthorhombic Cyclooctasulfur (S8) in

28

Gypsum Panel Products by Gas Chromatograph

Equipped with an Electron Capture Detector (GC/ECD)

Determination of Orthorhombic Cyclooctasulfur (S8) in

29

Gypsum Panel Products by High-performance Liquid

Chromatograph Equipped with and Ultraviolet Detector

(HPLC/UV)

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in these test methods.

1.4 These text of this test method 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.