ASTM C59/C59M-00(2020)
(Specification)Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster
Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster
ABSTRACT
This specification covers casting and molding plaster materials consisting essentially of calcined gypsum. The chemical composition of each plaster material should meet the required purity value. For samples, equal amounts of material should be taken from the outer and center of each package. Specimens shall also be tested for setting time, compressive strength and fineness.
SCOPE
1.1 This specification covers gypsum casting plaster and gypsum molding plaster materials consisting essentially of calcined gypsum.
1.2 The values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard.
1.4 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.
General Information
- Status
- Published
- Publication Date
- 30-Sep-2020
- Technical Committee
- C11 - Gypsum and Related Building Materials and Systems
- Drafting Committee
- C11.01 - Specifications and Test Methods for Gypsum Products
Relations
- Refers
ASTM C471M-24 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric) - Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2020
- Refers
ASTM C11-18a - Standard Terminology Relating to Gypsum and Related Building Materials and Systems - Effective Date
- 01-Oct-2018
- Refers
ASTM C11-18 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems - Effective Date
- 01-Jun-2018
- Refers
ASTM C11-17a - Standard Terminology Relating to Gypsum and Related Building Materials and Systems - Effective Date
- 01-Oct-2017
- Refers
ASTM C471M-17a - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric) - Effective Date
- 01-Oct-2017
- Refers
ASTM C471M-17e1 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric) - Effective Date
- 01-Jun-2017
- Refers
ASTM C471M-17 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric) - Effective Date
- 01-Jun-2017
- Refers
ASTM C11-17 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems - Effective Date
- 15-May-2017
- Refers
ASTM C471M-16a - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric) - Effective Date
- 15-Jun-2016
- Refers
ASTM C11-16 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems - Effective Date
- 15-May-2016
- Refers
ASTM C471M-16 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric) - Effective Date
- 01-Jan-2016
- Refers
ASTM C11-15a - Standard Terminology Relating to Gypsum and Related Building Materials and Systems - Effective Date
- 01-Oct-2015
- Refers
ASTM C11-15 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems - Effective Date
- 01-Apr-2015
- Refers
ASTM C471M-14 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric) - Effective Date
- 01-Nov-2014
Overview
ASTM C59/C59M-00(2020) sets the requirements for gypsum casting plaster and gypsum molding plaster. Issued by ASTM International, this standard specification applies to materials consisting primarily of calcined gypsum. It details the necessary chemical purity, physical properties, sampling procedures, testing, packaging, inspection, and certification requirements for these plasters. This standard ensures quality and consistency in products used for casting and molding applications, serving manufacturers, suppliers, and end-users across a range of industries.
Key Topics
- Material Composition: Specifies that gypsum casting plaster and molding plaster must consist essentially of calcined gypsum with at least 85% CaSO₄·2H₂O purity.
- Physical Properties: Establishes criteria for setting time (10 to 50 minutes), minimum compressive strength (1800 psi or 12.4 MPa), and fineness (all passing a No. 30 [600 µm] sieve, and at least 90% passing a No. 100 [150 µm] sieve).
- Sampling and Testing: Requires random sampling from not less than 1% of packages (but not fewer than five), with material taken from both the outer and center sections of each package. Composite samples are tested for compliance.
- Packaging and Marking: Products must be dry and free of lumps, shipped in properly marked packages indicating the manufacturer, brand, description, and net weight.
- Inspection and Certification: Inspection arrangements and the need for a certificate of compliance must be specified in the purchase agreement.
- Rejection Procedures: Provides processes for rejection if the material fails to meet the specified requirements.
Applications
Gypsum casting plaster and gypsum molding plaster are widely used in multiple sectors:
- Architectural Details: Forming decorative elements such as cornices, moldings, and ceiling medallions.
- Art and Craft: Creating sculptures, art ware, lamp bases, and ornamental items.
- Manufacturing: Producing precision molds for ceramics, pottery, and prototyping.
- Restoration: Repairing and reproducing historical plaster features in buildings.
- Medical Use: Crafting orthopedic casts and molds in some applications.
By adhering to ASTM C59/C59M-00(2020), manufacturers and end-users ensure that gypsum plasters meet recognized standards for quality, consistency, and performance, reducing risk and enhancing results in casting and molding processes.
Related Standards
- ASTM C11: Terminology Relating to Gypsum and Related Building Materials and Systems
- ASTM C471M: Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)
- ASTM C472: Test Methods for Physical Testing of Gypsum, Gypsum Plasters, and Gypsum Concrete
- ASTM E11: Specification for Woven Wire Test Sieve Cloth and Test Sieves
These referenced documents provide definitions, test methods, and additional guidelines supporting the implementation of ASTM C59/C59M for gypsum plasters.
By following ASTM C59/C59M-00(2020) for gypsum casting and molding plaster, stakeholders across construction, restoration, art, and manufacturing benefit from high-performance materials that meet strict industry standards for chemical and physical properties. This standard supports international quality assurance and compliance, enabling successful applications of gypsum plaster products.
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Frequently Asked Questions
ASTM C59/C59M-00(2020) is a technical specification published by ASTM International. Its full title is "Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster". This standard covers: ABSTRACT This specification covers casting and molding plaster materials consisting essentially of calcined gypsum. The chemical composition of each plaster material should meet the required purity value. For samples, equal amounts of material should be taken from the outer and center of each package. Specimens shall also be tested for setting time, compressive strength and fineness. SCOPE 1.1 This specification covers gypsum casting plaster and gypsum molding plaster materials consisting essentially of calcined gypsum. 1.2 The values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard. 1.4 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.
ABSTRACT This specification covers casting and molding plaster materials consisting essentially of calcined gypsum. The chemical composition of each plaster material should meet the required purity value. For samples, equal amounts of material should be taken from the outer and center of each package. Specimens shall also be tested for setting time, compressive strength and fineness. SCOPE 1.1 This specification covers gypsum casting plaster and gypsum molding plaster materials consisting essentially of calcined gypsum. 1.2 The values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard. 1.4 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.
ASTM C59/C59M-00(2020) is classified under the following ICS (International Classification for Standards) categories: 91.100.10 - Cement. Gypsum. Lime. Mortar. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM C59/C59M-00(2020) has the following relationships with other standards: It is inter standard links to ASTM C471M-24, ASTM C472-20, ASTM C11-18a, ASTM C11-18, ASTM C11-17a, ASTM C471M-17a, ASTM C471M-17e1, ASTM C471M-17, ASTM C11-17, ASTM C471M-16a, ASTM C11-16, ASTM C471M-16, ASTM C11-15a, ASTM C11-15, ASTM C471M-14. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM C59/C59M-00(2020) is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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.
Designation: C59/C59M −00 (Reapproved 2020)
Standard Specification for
Gypsum Casting Plaster and Gypsum Molding Plaster
This standard is issued under the fixed designation C59/C59M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3.1.1 Fordefinitionsoftermsusedinthisspecification,refer
to Terminology C11.
1.1 This specification covers gypsum casting plaster and
3.2 Definitions of Terms Specific to This Standard:
gypsum molding plaster materials consisting essentially of
3.2.1 gypsum casting plaster, n—a calcined gypsum plaster
calcined gypsum.
used primarily to form objects, such as lamp bases, art ware,
1.2 The values stated in either inch-pound or SI units are to
and novelties, etc.
be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to
3.2.2 gypsum molding plaster, n—a calcined gypsum plaster
ensure conformance with the standard, each system shall be
used primarily for plaster casts or molds, sometimes used as a
used independently of the other, and values from the two
gauging plaster.
systems shall not be combined.
4. Chemical Composition
1.3 The text of this standard references notes and footnotes
that provide explanatory material. These notes and footnotes
4.1 Gypsum casting plaster and gypsum molding plaster
shall not be considered as requirements of the standard.
shall have a purity of not less than 85 % CaSO ·2H O when
4 2
1.4 This international standard was developed in accor-
tested in accordance with Test Methods C471M.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Physical Properties
Development of International Standards, Guides and Recom-
5.1 Specimens shall be tested in accordance with Test
mendations issued by the World Trade Organization Technical
Methods C472.
Barriers to Trade (TBT) Committee.
5.1.1 Setting Time—Gypsum casting plaster and gypsum
2. Referenced Documents
molding plaster shall set in not less than 10 nor more than
2.1 ASTM Standards:
50 min using the procedure for gypsum concrete and all
C11 Terminology Relating to Gypsum and Related Building
gypsum plasters, except gypsum neat plaster.
Materials and Systems
5.1.2 Compressive Strength—Gypsum casting plaster and
C471M Test Methods for ChemicalAnalysis of Gypsum and
gypsum molding plaster shall have a compressive strength of
Gypsum Products (Metric)
not less than 1800 psi [12.4 MPa].
C472 Test Methods for Physical Testing of Gypsum, Gyp-
5.1.3 Fineness—Gypsum casting plaster and gypsum mold-
sum Plasters, and Gypsum Concrete
ing plaster shall all pass a No. 30 [600 µm] sieve and not less
E11 Specification for Woven Wire Test Sieve Cloth and Test
than 90 % shall pass a No. 100 [150 µm] sieve (Note 1).
Sieves
NOTE 1—Detailed requirements for these sieves are given in Specifi-
3. Terminology
cation E11.
3.1 Definitions:
6. Sampling
This specification is under the jurisdiction of ASTM Committee C11 on
Gypsum and Related Building Materials and Systems and is the direct responsibility
6.1 Randomly select not less than 1 % of the packages, but
of Subcommittee C11.01 on Specificat
...
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