ASTM C475/C475M-12e1
(Specification)Standard Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
Standard Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
ABSTRACT
This specification covers all-purpose, taping and finishing joint compounds, paper joint tape and glass-mesh joint tape. No cracks in the thinner half of the wedge and no deep fissure cracks in the thicker half of the wedge. Other physical properties such as putrefaction, shrinkage, joint tape, width, thickness and tensile strength shall also be determined. Tests such as dimensional stability test, assembly of taping or all-purpose compound and joint-tape test, bond test, edge cracking test, and skewness test are required for paper joint-tape.
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.
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´1
Designation:C475/C475M −12
StandardSpecification for
Joint Compound and Joint Tape for Finishing Gypsum
1
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 U.S. Department of Defense.
1
ε NOTE—Editorial corrections were made in November 2014.
1. Scope* D123 Terminology Relating to Textiles
D3882 Test Method for Bow and Skew in Woven and
1.1 This specification covers all-purpose, taping and finish-
Knitted Fabrics
ing joint compounds, paper joint tape and glass-mesh joint
F1615 Specification for Cautionary Labeling for Five-
tape.
Gallon Open-Head Plastic Containers
1.1.1 The joint materials used in this standard are designed
to be used with gypsum board installed in accordance with
3. Terminology
Specification C840.
3.1 Definitions—Definitions shall be in accordance with
1.2 This specification also covers the minimum require-
Terminology C11.
mentsforanassemblyoftapingandall-purposecompoundand
3.2 Definitions of Terms Specific to This Standard:
joint tape.
3.2.1 glass-mesh joint-tape, n—a strip of multidirectional
1.3 The text of this specification references notes and
glass yarn material designed to reinforce the joint between two
footnotes that provide explanatory material. These notes and
gypsum boards.
footnotes (excluding those in tables and figures) shall not be
3.2.2 joint tape, n—a strip of material used to conceal and
considered as requirements of the specification.
reinforce the joint between two gypsum boards.
1.4 The values stated in either inch-pound or SI (metric)
3.2.3 joint tape, self-adhering, n—a joint tape manufactured
units are to be regarded separately as standard. Within the text,
to adhere directly to the substrate.
theSIunitsareshowninparentheses.Thevaluesstatedineach
3.2.3.1 Discussion—Tapeshavingthisqualitydonotrequire
system shall be used independent of the other. Values from the
two systems shall not be combined. mechanical or embedment means of attachment to the sub-
strate.
2. Referenced Documents
3.2.4 paper joint tape, n—a strip of paper reinforcing
2
2.1 ASTM Standards:
materialdesignedtobeembeddedinthejointcompoundandto
C11 Terminology Relating to Gypsum and Related Building
reinforce the joint between two gypsum boards.
Materials and Systems
3.2.5 skewness, n—as defined in Terminology D123.
C474 Test Methods for Joint Treatment Materials for Gyp-
sum Board Construction
4. Physical Properties
C840 SpecificationforApplicationandFinishingofGypsum
Board
4.1 General—Thephysicalpropertiesshallbedeterminedin
accordance with Test Methods C474, except as noted.
1
This specification is under the jurisdiction of ASTM Committee C11 on 4.2 Joint Compounds.
Gypsum and Related Building Materials and Systems and is the direct responsibility
4.2.1 Check Cracking—No cracks in the thinner half of the
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
wedge and no deep fissure cracks in the thicker half of the
Related Products.
wedge.
Current edition approved Sept. 1, 2012. Published October 2012. Originally
approved in 1961. Last previous edition approved in 2007 as C475/C475M – 02
4.2.2 Putrefaction—No putrefaction in less than 4 days.
(2007). DOI: 10.1520/C0475_C0475M-12E01.
2 4.2.3 Shrinkage—Not more than 35 % by volume.
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
4.3 Joint Tape:
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.3.1 The following tests are required of all joint tape:
*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
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4.3.1.1 Width—Shall be not less than 1 ⁄8 in. (48 mm) nor 7. Rejection
1
more than 2 ⁄4 in. (60 mm). The width of an individual roll
7.1 Rejection of joint compound and joint tape that fails to
1
shall vary not more than 6 ⁄32 in. (1 mm).
conform to requirements of this specification shall be reported
4.3.1.2 Thickness—Shall be not more than 0.012 in.
to the producer or supplier promptly and in writing. The notice
(0.30 mm).
of rejection shall contain a statement documenting how the
4.3.1.3 Tensile Strength—Shall be not less than 30 lbf/in.
joint compound or joint tape has failed to conform to the
(5.25 N/mm) in the cross direction.
requirements of this specifi
...
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.
´1
Designation: C475/C475M − 12 C475/C475M − 12
Standard Specification for
Joint Compound and Joint Tape for Finishing Gypsum
1
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 U.S. Department of Defense.
1
ε NOTE—Editorial corrections were made in November 2014.
1. 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
2
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
D3382D3882 Test Methods for Measurement of Energy and Integrated Charge Transfer Due to Partial Discharges (Corona)
Using Bridge TechniquesMethod for Bow and Skew in Woven and Knitted Fabrics
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.
1
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 Sept. 1, 2012. Published October 2012. Originally approved in 1961. Last previous edition approved in 2007 as C475/C475M – 02 (2007). DOI:
10.1520/C0475_C0475M-12.10.1520/C0475_C0475M-12E01.
2
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—
*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
Tapes having this quality do not require mechanical or embedment means of attachment to the substrate.
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:
4.3.1 The following tests are required of all joint tape:
7 1
4.3.1.1 Width—Shall be not less than 1 ⁄8 in. in. (48 mm) nor more than 2 ⁄4 in. in. (60 mm). The width of an individual roll
1
shall vary not more than 6 ⁄32 in. (1 mm).
4.
...
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