ASTM C59/C59M-00(2011)

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-2011
• 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(2006) - Standard Specification for Gypsum Casting Plaster and Gypsum Molding Plaster
• Effective Date: 01-May-2011
• Referred By: ASTM C11-23 - Standard Terminology Relating to Gypsum and Related Building Materials and Systems
• 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-2011
• Referred By: ASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum Plaster
• Effective Date: 01-May-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 2011)
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 3.2.2 gypsum molding plaster, n—acalcinedgypsumplaster
used primarily for plaster casts or molds, sometimes used as a
1.1 This specification covers gypsum casting plaster and
gauging plaster.
gypsum molding plaster materials consisting essentially of
calcined gypsum.
4. Chemical Composition
1.2 The values stated in either inch-pound or SI (metric)
4.1 Gypsum casting plaster and gypsum molding plaster
units are to be regarded as standard. Within the text, the SI
shall have a purity of not less than 85 % CaSO ·2H O when
4 2
units are shown in brackets. The values stated in each system
tested in accordance with Test Methods C471M.
shall be used independently of the other. Values from the two
systems shall not be combined.
5. Physical Properties
1.3 The text of this standard references notes and footnotes
5.1 Specimens shall be tested in accordance with Test
that provide explanatory material. These notes and footnotes
Methods C472.
shall not be considered as requirements of the standard.
5.1.1 Setting Time—Gypsum casting plaster and gypsum
molding plaster shall set in not less than 10 nor more than 50
2. Referenced Documents
min using the procedure for gypsum concrete and all gypsum
plasters, except gypsum neat plaster.
2.1 ASTM Standards:
5.1.2 Compressive Strength—Gypsum casting plaster and
C11 Terminology Relating to Gypsum and Related Building
gypsum molding plaster shall have a compressive strength of
Materials and Systems
not less than 1800 psi [12.4 MPa].
C471M Test Methods for ChemicalAnalysis of Gypsum and
5.1.3 Fineness—Gypsum casting plaster and gypsum mold-
Gypsum Products (Metric)
ing plaster shall all pass a No. 30 [600-µm] sieve and not less
C472 Test Methods for Physical Testing of Gypsum, Gyp-
than 90 % shall pass a No. 100 [150-µm] sieve.
sum Plasters and Gypsum Concrete
E11 Specification for Woven Wire Test Sieve Cloth and Test
6. Sampling
Sieves
6.1 Randomly select not less than 1 % of the packages, but
3. Terminology not less than 5 packages. Take samples of approximately equal
amounts both from the outer portion and the center of each
3.1 Definitions of terms shall be in accordance with Termi-
package. Mix the samples so obtained to provide a composite
nology C11.
sample of not less than 7 lb [3 kg]. Immediately place the
3.2 Definitions of Terms Specific to This Standard:
composite sample in a clean, dry, airtight container for delivery
3.2.1 gypsum casting plaster, n—a calcined gypsum plaster
to the laboratory.
used primarily to form objects, such as lamp bases, art ware,
and novelties, etc.
7. Inspection
7.1 Inspection of the gypsum casting and molding plaster
shall be agreed upon by the purchaser and the supplier as part
This specification is under the jurisdiction of ASTM Committee C11 on
of the purchase ag
...