ASTM C59/C59M-00(2006)

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 (metric) units are to be regarded as 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 standard references notes and footnotes that provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard.

General Information

• Status: Historical
• Publication Date: 30-Apr-2006
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.01 - Specifications and Test Methods for Gypsum Products

Relations

• Replaces: ASTM C59/C59M-00 - Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster
• Effective Date: 01-May-2006
• Replaced By: ASTM C59/C59M-00(2011) - Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster
• Effective Date: 01-May-2011
• Referred By: ASTM F2224-09(2020) - Standard Specification for High Purity Calcium Sulfate Hemihydrate or Dihydrate for Surgical Implants
• Effective Date: 01-May-2006
• Referred By: ASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum Plaster
• Effective Date: 01-May-2006
• Referred By: ASTM C11-23 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• Effective Date: 01-May-2006

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C59/C59M – 00 (Reapproved 2006)
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 Department of Defense.
1. Scope 4. Chemical Composition
4.1 Gypsum casting plaster and gypsum molding plaster
1.1 This specification covers gypsum casting plaster and
gypsum molding plaster materials consisting essentially of shall have a purity of not less than 85 % CaSO ·2H O when
4 2
calcined gypsum. tested in accordance with Test Methods C471M.
1.2 The values stated in either inch-pound or SI (metric)
5. Physical Properties
units are to be regarded as standard. Within the text, the SI
5.1 Specimens shall be tested in accordance with Test
units are shown in brackets. The values stated in each system
shall be used independently of the other. Values from the two Methods C472.
5.1.1 Setting Time—Gypsum casting plaster and gypsum
systems shall not be combined.
1.3 The text of this standard references notes and footnotes molding plaster shall set in not less than 10 nor more than 50
min using the procedure for gypsum concrete and all gypsum
that provide explanatory material. These notes and footnotes
shall not be considered as requirements of the standard. plasters, except gypsum neat plaster.
5.1.2 Compressive Strength—Gypsum casting plaster and
2. Referenced Documents
gypsum molding plaster shall have a compressive strength of
2.1 ASTM Standards: not less than 1800 psi [12.4 MPa].
C11 TerminologyRelatingtoGypsumandRelatedBuilding 5.1.3 Fineness—Gypsum casting plaster and gypsum mold-
Materials and Systems ing plaster shall all pass a No. 30 [600-µm] sieve and not less
C471M Test Methods for Chemical Analysis of Gypsum than 90 % shall pass a No. 100 [150-µm] sieve.
and Gypsum Products (Metric)
6. Sampling
C472 Test Methods for Physical Testing of Gypsum, Gyp-
sum Plasters and Gypsum Concrete 6.1 Randomly select not less than 1 % of the packages, but
E11 SpecificationforWovenWireTestSieveClothandTest not less than 5 packages. Take samples of approximately equal
amounts both from the outer portion and the center of each
Sieves
package. Mix the samples so obtained to provide a composite
3. Terminology
sample of not less than 7 lb [3 kg]. Immediately place the
3.1 Definitions of terms shall be in accordance with Termi- composite sample in a clean, dry, airtight container for delivery
nology C11. to the laboratory.
3.2 Description of Terms Specific to This Standard:
7. Inspection
3.2.1 gypsum casting plaster, n—a calcined gypsum plaster
7.1 Inspection of the gypsum casting and molding plaster
used primarily to form objects, such as lamp bases, art ware,
and novelties, etc. shall be agreed upon by the purchaser and the supplier as part
of the purchase agreement.
3.2.2 gypsum molding plaster, n—acalcinedgypsumplaster
used primarily for plaster casts or molds, sometimes u
...

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:C59/C59M–00 Designation: C 59/C 59M – 00 (Reapproved 2006)
Standard Specification for
Gypsum Casting Plaster and Gypsum Molding Plaster
This standard is issued under the fixed designation C 59/C 59M; 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 Department of Defense.
1. 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 (metric) units are to be regarded as 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 standard references notes and footnotes that provide explanatory material. These notes and footnotes shall
not be considered as requirements of the standard.
2. Referenced Documents
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C 471M Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)
C 472 Test Methods for Physical Testing of Gypsum, Gypsum Plasters and Gypsum Concrete
E11 Specification for Wire- Cloth and Sieves for Testing Purposes
3. Terminology
3.1 Definitions of terms shall be in accordance with Terminology C 11.
3.2 Description of Terms Specific to This Standard:
3.2.1 gypsum casting plaster, n—a calcined gypsum plaster used primarily to form objects, such as lamp bases, art ware, and
novelties, etc.
3.2.2 gypsum molding plaster, n—a calcined gypsum plaster used primarily for plaster casts or molds, sometimes used as a
gauging plaster.
4. Chemical Composition
4.1 Gypsum casting plaster and gypsum molding plaster shall have a purity of not less than 85 % CaSO ·2H O when tested
4 2
in accordance with Test Methods C 471M.
5. Physical Properties
5.1 Specimens shall be tested in accordance with Test Methods C 472.
5.1.1 Setting Time—Gypsumcastingplasterandgypsummoldingplastershallsetinnotlessthan10normorethan50minusing
the procedure for gypsum concrete and all gypsum plasters, except gypsum neat plaster.
5.1.2 Compressive Strength—Gypsum casting plaster and gypsum molding plaster shall have a compressive strength of not less
than 1800 psi [12.4 MPa].
5.1.3 Fineness—Gypsum casting plaster and gypsum molding plaster shall all pass a No. 30 [600-µm] sieve and not less than
90 % shall pass a No. 100 [150-µm] sieve.
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 July 10, 2000. Published August 2000. Originally published as C59–26. Last previous edition C59–95.
Current edition approved May 1, 2006. Published May 2006. Originally approved in 1926. Last previous edition approved in 2000 as C 59/C 59M – 00.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
, Vol 04.01.volume information, refer to the standard’
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