ASTM C475-94

Standard Specification for Joint Compound and Joint Tape for Finishing Gypsum Board

SCOPE
1.1 This specification covers all-purpose, taping and finishing joint compounds, and paper joint tape.
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 which 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 inch-pound units are to be regarded as the standard.

General Information

• Status: Historical
• Publication Date: 09-Apr-2001
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.02 - Specifications and Test Methods for Accessories and Related Products

Relations

• Replaced By: ASTM C475-01 - Standard Specification for Joint Compound and Joint Tape for Finishing Gypsum Board
• Effective Date: 10-Apr-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 475 – 94
Standard Specification for
Joint Compound and Joint Tape for Finishing Gypsum
1
Board
This standard is issued under the fixed designation C 475; 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 (e) 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
1. Scope shall vary not more than 6 ⁄32 in. (0.8 mm).
4.3.2 Thickness—Shall be not more than 0.012 in. (0.30
1.1 This specification covers all-purpose, taping and finish-
mm).
ing joint compounds, and paper joint tape.
4.3.3 Tensile Strength—Shall be not less than 30 lbf/in. (524
1.2 This specification also covers the minimum require-
N/mm) in the cross direction.
ments for an assembly of taping and all-purpose compound and
4.3.4 Dimensional Stability—Shall expand not more than
joint tape.
0.4 % lengthwise and not more than 2.5 % crosswise.
1.3 The values stated in inch-pound units are to be regarded
4.4 Assembly of Taping or All-Purpose Compound and Joint
as the standard.
Tape:
2. Referenced Documents 4.4.1 Bond between the joint tape and the joint compound
shall be not less than 90 %.
2.1 ASTM Standards:
4.4.2 Edge Cracking shall be not more than 10 % along the
C 11 Terminology Relating to Gypsum and Related Build-
2
edges of the tape specimen.
ing Materials and Systems
C 474 Test Methods for Joint Treatment Materials for Gyp-
5. Sampling
2
sum Board Construction
5.1 Sampling of Joint Compound—At least 1 %, but not less
3. Terminology than one package or container shall be sampled and shall be so
selected as to be representative of the shipment. The material
3.1 Definitions—Definitions shall be in accordance with
so obtained shall be thoroughly blended and divided. Provide
Terminology C 11.
not less than one 6-lb (2.72-kg) sample for the test.
3.2 Definitions of Terms Specific to This Standard:
5.2 Sampling of Joint Tape—At least one roll for every ten
3.2.1 joint-tape, n—a strip of paper reinforcing material
cases or a fraction thereof, but not more than ten rolls per
designed to be embedded in the joint compound.
shipment shall constitute a sample.
4. Physical Properties
6. Inspection
4.1 General—The physical properties shall be determined
6.1 Inspection of the joint compound and joint tape shall be
in accordance with Test Methods C 474.
agreed upon between the purchaser and the supplier as part of
4.2 Joint Compounds.
the purchase agreement.
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
7. Rejection
wedge.
7.1 Rejection of joint compound and joint tape that fails to
4.2.2 Putrefaction—No putrefaction in less than 4 days.
conform to requirements of this specification shall be reported
4.2.3 Shrinkage—Not more than 35 % by volume.
to the producer or supplier promptly and in writing. The notice
4.3 Joint Tape:
of rejection shall contain a statement documenting how the
7
4.3.1 Width—Shall be not less than 1 ⁄8 in. (47.6 mm) nor
1 joint compound or joint tape has failed to conform to the
more than 2 ⁄4 in. (57.2 mm). The width of an individual roll
requirements of this specification.
1
This specification is under the jurisdiction of ASTM Committee C-11 on 8. Certification
Gypsum and Related Building Materials and Systems and is the direct responsibility
8.1 When specified in the purchase agreement, a producer’s
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
or supplier’s report shall be furnished at the time of shipment
Related Products.
Current edition approved Aug. 15, 1994. Published October 1994. Originally
certifying that the product is in compliance with this specifi-
published as C 475 – 61 T. Last previous edition C 475 – 93.
cation.
2
Annual Book of ASTM Standards, Vol 04.01.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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C 475
9. Packaging and Package Marking WARNING” in upper case letters, preceded by a safety alert
symbol consisting of an exclamation mark inside an equilateral
9.1 Joint compound and joint tape shall be marked on each
triangle with the apex of the triangle oriented upward. The
item or package with the name, brand or trademark of the
word “WARNING” shall be on one line and shall be in letters
manufacturer or seller, size, and volume or net weight of
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not less than ⁄16 in. (7.9 mm) high. Where two cautionary
contents.
1 1 labels are used they shall conform to 9.2.2.1 and the word
9.2 Joint compound packaged in 3- ⁄2 through 6- ⁄2 gal (U.S.
1
“WARNING” shall be in letters not less than ⁄
...