ASTM C475/C475M-12

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Designation: C475/C475M − 02 (Reapproved 2007) C475/C475M − 12
Standard Specification for
Joint Compound and Joint Tape for Finishing Gypsum
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Board
This standard is issued under the fixed designation C475/C475M; 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 Scope*
1.1 This specification covers all-purpose, taping and finishing joint compounds, paper joint tape and glass-mesh joint tape.
1.1.1 The joint materials used in this standard are designed to be used with gypsum board installed in accordance with
Specification C840.
1.2 This specification also covers the minimum requirements for an assembly of taping and all-purpose compound and joint
tape.
1.3 The text of this specification 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 the specification.
1.4 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standard. Within the text, the SI
units are shown in parentheses. The values stated in each system shall be used independent of the other. Values from the two
systems shall not be combined.
2. Referenced Documents
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2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C474 Test Methods for Joint Treatment Materials for Gypsum Board Construction
C840 Specification for Application and Finishing of Gypsum Board
D123 Terminology Relating to Textiles
D3382 Test Methods for Measurement of Energy and Integrated Charge Transfer Due to Partial Discharges (Corona) Using
Bridge Techniques
F1615 Specification for Cautionary Labeling for Five-Gallon Open-Head Plastic Containers
3. Terminology
3.1 Definitions—Definitions shall be in accordance with Terminology C11.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 glass-mesh joint-tape, n—a strip of multidirectional glass yarn material designed to reinforce the joint between two
gypsum boards.
3.2.2 joint tape, n—a strip of material used to conceal and reinforce the joint between two gypsum boards.
3.2.3 joint tape, self-adhering, n—a joint tape manufactured to adhere directly to the substrate.
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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 C11.02 on Specifications and Test Methods for Accessories and Related Products.
Current edition approved June 1, 2007Sept. 1, 2012. Published October 20072012. Originally approved in 1961. Last previous edition approved in 20022007 as
C475 – 02.C475/C475M – 02 (2007). DOI: 10.1520/C0475_C0475M-02R07.10.1520/C0475_C0475M-12.
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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.
3.2.3.1 Discussion—
Tapes having this quality do not require mechanical or embedment means of attachment to the substrate.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C475/C475M − 12
3.2.4 paper joint tape, n—a strip of paper reinforcing material designed to be embedded in the joint compound and to reinforce
the joint between two gypsum boards.
3.2.5 skewness, n—as defined in Terminology D123.
4. Physical Properties
4.1 General—The physical properties shall be determined in accordance with Test Methods C474, except as noted.
4.2 Joint Compounds.
4.2.1 Check Cracking—No cracks in the thinner half of the wedge and no deep fissure cracks in the thicker half of the wedge.
4.2.2 Putrefaction—No putrefaction in less than 4 days.
4.2.3 Shrinkage—Not more than 35 % by volume.
4.3 Joint Tape—Tape: The following tests are required of all joint tape:
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4.3.1 Width—Shall be not less than 1 ⁄8 in. (48 mm) nor more than 2 ⁄4 in. (60 mm). The width of an individual roll shall vary
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not more than 6The following tests are required of all joint tape: ⁄32 in. (1 mm).
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4.3.1.1 Width—Shall be not le
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