ASTM C473-19

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Designation: C473 − 17 C473 − 19
Standard Test Methods for
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Physical Testing of Gypsum Panel Products
This standard is issued under the fixed designation C473; 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 These test methods cover the physical testing of gypsum panel products.
1.2 The test methods appear in the following order:
Section
Flexural Strength (Method A) 7
Core, End and Edge Hardness (Method A) 8
Nail Pull Resistance (Method A) 9
Flexural Strength (Method B) 11
Core, End and Edge Hardness (Method B) 12
Nail Pull Resistance (Method B) 13
Humidified Deflection 14
End Squareness 15
Nominal Thickness 16
Recessed- or Tapered Edge Depth 17
Width 18
Length 19
Water Resistance of Core-Treated Water-Repellent
Gypsum Panel Products 20
Surface Water Resistance of Gypsum Panel Products
with Water-Repellent Surfaces 21
1.3 The values stated in inch-pound units are to be regarded as standard with the exception of weight of samples in SI gram
units. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not
considered standard.
1.4 The text of these test methods 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 these test methods.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 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.
2. Referenced Documents
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2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C1264 Specification for Sampling, Inspection, Rejection, Certification, Packaging, Marking, Shipping, Handling, and Storage of
Gypsum Panel Products
E4 Practices for Force Verification of Testing Machines
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
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These test methods are under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and are the direct responsibility of
Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.
Current edition approved Oct. 1, 2017Oct. 1, 2019. Published November 2017October 2019. Originally approved in 1961. Last previous edition approved in 20162017
as C473 – 16.C473 – 17. DOI: 10.1520/C0473-17.10.1520/C0473-19.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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C473 − 19
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2.2 Other Standards:
TAPPI T441 Water Absorptiveness of Sized (Non-Bibulous) Paper, Paperboard, and Corrugated Fiberboard (Cobb Test)
3. Terminology
3.1 Definitions used in these test methods are in accordance with Terminology C11.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 edge, n—the paper-bound edge, or long edge, as manufactured.
3.2.2 ends, n—the end perpendicular to the paper-bound edge or long edge.
3.2.3 Test Uncertainty Ratio (TUR),n—(tolerance of measure) / (precision of the standard measuring instrument)
4. Sampling
4.1 For use in these test methods, a sample shall consist of not less than 0.25 % of the number of gypsum panel products in
a shipment, but not less than three gypsum panel products. Test specimens shall be taken from the sample lot as indicated in each
method.samples obtained in accordance with Specification C1264.
5. Conditio
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