ASTM C473-09

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Designation: C473 – 09
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* C11 TerminologyRelatingtoGypsumandRelatedBuilding
Materials and Systems
1.1 These test methods cover the physical testing of gypsum
D3285 Test Method for Water Absorptiveness of Nonbibu-
panel products.
lous Paper and Paperboard (Cobb Test)
1.2 The test methods appear in the following order:
E4 Practices for Force Verification of Testing Machines
Section
E177 Practice for Use of the Terms Precision and Bias in
Flexural Strength (Method A) 7
Core, End and Edge Hardness (Method A) 8
ASTM Test Methods
Nail Pull Resistance (Method A) 9
E691 Practice for Conducting an Interlaboratory Study to
Flexural Strength (Method B) 11
Determine the Precision of a Test Method
Core, End and Edge Hardness (Method B) 12
Nail Pull Resistance (Method B) 13
Humidified Deflection 14
3. Terminology
End Squareness 15
3.1 Definitions used in these test methods are in accordance
Nominal Thickness 16
Recessed- or Tapered Edge Depth 17
with Terminology C11.
Width 18
3.2 Definitions of Terms Specific to This Standard:
Length 19
3.2.1 edge, n—the paper-bound edge, or long edge, as
Water Resistance of Core-Treated Water-Repellent
Gypsum Panel Products 20
manufactured.
Surface Water Resistance of Gypsum Panel Products
3.2.2 ends, n—the end perpendicular to the paper-bound
with Water-Repellent Surfaces 21
edge or long edge.
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical 4. Sampling
conversions to SI units that are provided for information only
4.1 For use in these test methods, a sample shall consist of
and are not considered standard.
not less than 0.25 % of the number of gypsum panel products
1.4 The text of these test methods references notes and
in a shipment, but not less than three gypsum panel products.
footnotes that provide explanatory material. These notes and
Test specimens shall be taken from the sample lot as indicated
footnotes, excluding those in tables and figures, shall not be
in each method.
considered as requirements of these test methods.
1.5 This standard does not purport to address all of the 5. Conditioning
safety concerns, if any, associated with its use. It is the
5.1 Conditionspecimenstoconstantweightatatemperature
responsibility of the user of this standard to establish appro-
of 85 6 15 °F (29.5 6 8.5 °C) and relative humidity of 50 6
priate safety and health practices and determine the applica-
2% (Note 1). Test specimens individually after constant
bility of regulatory limitations prior to use.
weight is reached and within 10 min upon removal from the
conditioning chamber.
2. Referenced Documents
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NOTE 1—Laboratory test results indicated that conditioning tempera-
2.1 ASTM Standards:
tures may range from 70 to 100 °F (21 to 38 °C) without significantly
affecting the results. However, relative humidity is critical. This is the
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reason for testing specimens within 10 min upon removal from the
These test methods are under the jurisdiction of ASTM Committee C11 on
conditioning chamber.
Gypsum and Related Building Materials and Systems and are the direct responsi-
bility of Subcommittee C11.01 on Specifications and Test Methods for Gypsum
Products.
Current edition approved Sept. 1, 2009. Published September 2009. Originally
approved in 1961. Last previous edition approved in 2007 as C473 – 07. DOI:
10.1520/C0473-09.
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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 – 09
Method A—Constant Rate of Loading the specimen at one half of the specimen width and one half of
the distance between the supports.
INTRODUCTION
7.4 Sampling—Sampling shall be in accordance with Sec-
The following procedures are applicable to so-called “shot
tion 4.
machines” that utilize lead or steel shot that applies a load to 7.5 Test Specimens:
the specimen at a constant stress rate or any other device that
7.5.1 Cut four specimens, each 12 in. (305 mm) by approxi-
applies the load at a constant stress rate. mately16in.(406mm)f
...