1、Designation: C475/C475M 17Standard Specification forJoint Compound and Joint Tape for Finishing GypsumBoard1This standard is issued under the fixed designation C475/C475M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of
2、 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. Scope*1.1 This specification covers all-
3、purpose, taping and finish-ing joint compounds, paper joint tape, and glass-mesh jointtape.1.1.1 The joint materials used in this standard are designedto be used with gypsum board installed in accordance withSpecification C840.1.2 This specification also covers the minimum require-ments for an assem
4、bly of taping and all-purpose compound andjoint tape.1.3 The text of this specification references notes andfootnotes that provide explanatory material. These notes andfootnotes (excluding those in tables and figures) shall not beconsidered as requirements of the specification.1.4 The values stated
5、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 eachsystem shall be used independent of the other. Values from thetwo systems shall not be combined.1.5 This international standard was deve
6、loped in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Doc
7、uments2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC474 Test Methods for Joint Treatment Materials for Gyp-sum Board ConstructionC840 Specification forApplication and Finishing of GypsumBoardD123 Terminology Relating to TextilesD3882 Test Method for
8、 Bow and Skew in Woven andKnitted FabricsF1615 Specification for Cautionary Labeling for Five-Gallon Open-Head Plastic Containers3. Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 glass-mesh joint-tape, na stri
9、p of multidirectionalglass yarn material designed to reinforce the joint between twogypsum boards.3.2.2 joint tape, na strip of material used to conceal andreinforce the joint between two gypsum boards.3.2.3 joint tape, self-adhering, na joint tape manufacturedto adhere directly to the substrate.3.2
10、.3.1 DiscussionTapes having this quality do not requiremechanical or embedment means of attachment to the sub-strate.3.2.4 paper joint tape, na strip of paper reinforcingmaterial designed to be embedded in the joint compound and toreinforce the joint between two gypsum boards.3.2.5 skewness, nas def
11、ined in Terminology D123.4. Physical Properties4.1 GeneralThe physical properties shall be determined inaccordance with Test Methods C474, except as noted.4.2 Joint Compounds.4.2.1 Check CrackingNo cracks in the thinner half of thewedge and no deep fissure cracks in the thicker half of thewedge.4.2.
12、2 PutrefactionNo putrefaction in less than four days.4.2.3 ShrinkageNot more than 35 % by volume.4.3 Joint Tape:1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.02 on Specificat
13、ions and Test Methods for Accessories andRelated Products.Current edition approved Oct. 1, 2017. Published November 2017. Originallyapproved in 1961. Last previous edition approved in 2015 as C475/C475M 15.DOI: 10.1520/C0475_C0475M-17.2For referenced ASTM standards, visit the ASTM website, www.astm.
14、org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C
15、700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the
16、World Trade Organization Technical Barriers to Trade (TBT) Committee.14.3.1 The following tests are required of all joint tape:4.3.1.1 WidthShall be not less than 178 in. (48 mm) normore than 214 in. (60 mm). The width of an individual rollshall vary not more than 6132 in. (1 mm).4.3.1.2 ThicknessSh
17、all be not more than 0.012 in.(0.30 mm).4.3.1.3 Tensile Strength:(1) Type I joint tapeShall be not less than 22.0 lbf/in.(3.85 N/mm) in the cross direction.(2) Type II joint tapeShall be not less than 30.0 lbf/in.(5.25 N/mm) in the cross direction.4.3.2 The following tests are required of paper join
18、t tape:4.3.2.1 Dimensional StabilityShall expand not more than0.4 % lengthwise and not more than 2.5 % crosswise.4.3.3 The following test is required of glass-mesh joint tape:4.3.3.1 Skewness, when tested in accordance with TestMethod D3882, shall be not more than 8.75 %.4.4 Assembly of Taping or Al
19、l-Purpose Compound andPaper Joint Tape:4.4.1 Bond between the joint tape and the joint compoundshall be not less than 90 %.4.4.2 Edge cracking shall be not more than 10 % along theedges of the tape specimen.5. Sampling5.1 Sampling of Joint CompoundAt least 1 %, but not lessthan one package or contai
20、ner shall be sampled and shall be soselected as to be representative of the shipment. The materialso obtained shall be thoroughly blended and divided. Providenot less than one 6-lb (2.75 kg) sample for the test.5.2 Sampling of Joint TapeAt least one roll for every tencases or a fraction thereof, but
21、 not more than ten rolls pershipment shall constitute a sample.6. Inspection6.1 Inspection of the joint compound and joint tape shall beagreed upon between the purchaser and the supplier as part ofthe purchase agreement.7. Rejection7.1 Rejection of joint compound and joint tape that fails toconform
22、to requirements of this specification shall be reportedto the producer or supplier promptly and in writing. The noticeof rejection shall contain a statement documenting how thejoint compound or joint tape has failed to conform to therequirements of this specification.8. Certification8.1 When specifi
23、ed in the purchase agreement, a producersor suppliers report shall be furnished at the time of shipmentcertifying that the product is in compliance with this specifi-cation.9. Packaging and Package Marking9.1 Joint compound and joint tape shall be marked on eachitem or package with the name, brand o
24、r trademark of themanufacturer or seller, size, and volume or net weight ofcontents.9.2 Joint compound packaged in open-head pails that arecovered by Specification F1615 shall be labeled in accordancewith Specification F1615.10. Keywords10.1 all-purpose compound; bond; check cracking; dimen-sional s
25、tability; edge cracking; finishing compound; glass-mesh joint tape; joint compound; joint tape; paper joint tape;putrefaction; shrinkage; taping compound; tensile strength;topping compoundSUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this standard since the last
26、issue(C475/C475M 15) that may impact the use of this standard. (Approved Oct. 1, 2017.)(1) Revised 4.3.1.3.Committee C11 has identified the location of selected changes to this standard since the last issue(C475/C475M 121) that may impact the use of this standard. (Approved June 1, 2015.)(1) Revised
27、 subsection 9.2 to bring C475/C475M into agree-ment with Specification F1615.Committee C11 has identified the location of selected changes to this standard since the last issue(C475/C475M 02 (2007) that may impact the use of this standard. (Approved Sept. 1, 2014.)(1) Revised 4.3 to include all stan
28、dards pertaining to joint tapealone, including glass mesh tape.(2) Revised 4.4 to pertain to the assembly of paper joint tapeand taping or all-purpose joint compound.C475/C475M 172ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item m
29、entionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committ
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