ASTM C22/C22M-00(2015)

Standard Specification for Gypsum

ABSTRACT
This specification covers gypsum, calcium sulfate combined with two molecules of water in crystalline form. If necessary, gypsum shall be crushed or ground, or both, to the size specified. Different test methods shall be performed in order to determine the chemical composition and physical properties of gypsum.
SCOPE
1.1 This specification covers gypsum, calcium sulfate combined with two molecules of water in crystalline form and having the approximate chemical formula CaSO4·2H2O.  
1.2 The values stated in either inch-pound units or SI (metric) are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values stated in each system shall be used independently of the other. Values from the two systems shall not be combined.  
1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.

General Information

• Status: Historical
• Publication Date: 30-Sep-2015
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.01 - Specifications and Test Methods for Gypsum Products

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C22/C22M −00 (Reapproved 2015)
Standard Specification for
Gypsum
This standard is issued under the fixed designation C22/C22M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Physical Properties
1.1 This specification covers gypsum, calcium sulfate com- 5.1 Size—If necessary, gypsum shall be crushed or ground,
bined with two molecules of water in crystalline form and or both, to the size specified in the purchase order.
having the approximate chemical formula CaSO ·2H O.
4 2
6. Sampling
1.2 The values stated in either inch-pound units or SI
(metric) are to be regarded separately as the standard. Within
6.1 Bulk—When gypsum is shipped in bulk, samples of
the text, the SI units are shown in brackets. The values stated
approximately 5 lb [2 kg] each shall be taken at regular
in each system shall be used independently of the other. Values
intervals during the complete loading or unloading of the
from the two systems shall not be combined.
carrier, in such a way as to accumulate not less than 200 lb [90
kg] of material and to represent correctly the percentages of
1.3 The text of this specification references notes and
both the coarse particles and the fines in the shipment. This
footnotes which provide explanatory material. These notes and
material shall be broken to pass a 1-in. [25.0-mm] sieve,
footnotes (excluding those in tables and figures) shall not be
thoroughly mixed, and reduced by quartering to provide not
considered as requirements of the specification.
less than a 1-lb [0.5-kg] sample for the laboratory.
2. Referenced Documents
6.2 Packages—When gypsum is shipped in packages, not
less than 1 % of the packages shall be sampled. Samples shall
2.1 ASTM Standards:
be taken from both the surface and the center of the packages.
C11 Terminology Relating to Gypsum and Related Building
These samples shall then be broken, mixed, and quartered in
Materials and Systems
accordance with 6.1.
C471M Test Methods for ChemicalAnalysis of Gypsum and
Gypsum Products (Metric)
6.3 Laboratory Samples—Each laboratory sample shall be
C472 Test Methods for Physical Testing of Gypsum, Gyp-
placed immediately in an airtight container and shipped to the
sum Plasters and Gypsum Concrete
laboratory for testing.
3. Terminology
7. Test Methods
3.1 Definitions—Definitions shall be in accordance with
7.1 The chemical composition of gypsum shall be deter-
Terminology C11.
mined in accordance with Test Methods C471M.
7.2 The physical properties of gypsum shall be determined
4. Chemical Composition
in accordance with Test Methods C472.
4.1 Gypsum shall contain not less than 70.0 weight percent
CaSO ·2H O.
4 2
8. Inspection
4.2 The chemical composition, within the limits prescribed
8.1 Inspection of the gypsum shall be agreed upon between
by 4.1, shall be specified in the purchase order or contract.
the purchaser and the supplier as part of the purchase agree-
ment.
This specification is under the jurisdiction of ASTM Committee C11 on
9. Rejection
Gypsum and Related Building Materials and Systems and is the direct
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C22/C22M − 00 (Reapproved 2010) C22/C22M − 00 (Reapproved 2015)
Standard Specification for
Gypsum
This standard is issued under the fixed designation C22/C22M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers gypsum, calcium sulfate combined with two molecules of water in crystalline form and having the
approximate chemical formula CaSO ·2H O.
4 2
1.2 The values stated in either inch-pound units or SI (metric) are to be regarded separately as the standard. Within the text, the
SI units are shown in brackets. The values stated in each system shall be used independently of the other. Values from the two
systems shall not be combined.
1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the specification.
2. Referenced Documents
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C471M Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)
C472 Test Methods for Physical Testing of Gypsum, Gypsum Plasters and Gypsum Concrete
3. Terminology
3.1 Definitions—Definitions shall be in accordance with Terminology C11.
4. Chemical Composition
4.1 Gypsum shall contain not less than 70.0 weight percent CaSO ·2H O.
4 2
4.2 The chemical composition, within the limits prescribed by 4.1, shall be specified in the purchase order or contract.
5. Physical Properties
5.1 Size—If necessary, gypsum shall be crushed or ground, or both, to the size specified in the purchase order.
6. Sampling
6.1 Bulk—When gypsum is shipped in bulk, samples of approximately 5 lb [2 kg] each shall be taken at regular intervals during
the complete loading or unloading of the carrier, in such a way as to accumulate not less than 200 lb [90 kg] of material and to
represent correctly the percentages of both the coarse particles and the fines in the shipment. This material shall be broken to pass
a 1-in. [25.0-mm] sieve, thoroughly mixed, and reduced by quartering to provide not less than a 1-lb [0.5-kg] sample for the
laboratory.
6.2 Packages—When gypsum is shipped in packages, not less than 1 % of the packages shall be sampled. Samples shall be
taken from both the surface and the center of the packages. These samples shall then be broken, mixed, and quartered in accordance
with 6.1.
6.3 Laboratory Samples—Each laboratory sample shall be placed immediately in an airtight container and shipped to the
laboratory for testing.
This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved Oct. 1, 2010Oct. 1, 2015. Published December 2010October 2015. Originally approved in 1919. Last previous edition approved in 20052010
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