1、Designation: C318/C318M 13 (Reapproved 2018)Standard Specification forGypsum Formboard1This standard is issued under the fixed designation C318/C318M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A num
2、ber 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 the minimum requirements
3、forgypsum formboard designed for use as a permanent form forpoured-in-place reinforced gypsum concrete roof decks.1.2 The values stated in either inch-pound units or SI(metric) are to be regarded separately as standard. Within thetext, the SI units are shown in brackets. The values stated ineach sys
4、tem shall be used independent of the other. Valuesfrom the two systems shall not be combined.1.3 The text of this standard references notes which provideexplanatory material. These notes shall not be consideredrequirements of the standard.1.4 This international standard was developed in accor-dance
5、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 Documents2.1 ASTM Standa
6、rds:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC22 Specification for GypsumC473 Test Methods for Physical Testing of Gypsum PanelProductsC1264 Specification for Sampling, Inspection, Rejection,Certification, Packaging, Marking, Shipping, Handling,and Storage of Gyps
7、um Panel ProductsG21 Practice for Determining Resistance of Synthetic Poly-meric Materials to Fungi3. Terminology3.1 DefinitionsDefinitions of terms used in this standardshall be in accordance with Terminology C11.4. Materials and Manufacture4.1 Gypsum formboard shall consist of a noncombustiblecore
8、, essentially gypsum complying with Specification C22,containing not more than 15 % by weight of fiber, eithermineral or organic, synthetic or natural.4.2 The face surface shall be specifically treated to resistfungus growth.5. Physical Properties5.1 Specimens shall be tested in accordance with Test
9、Methods C473.NOTE 1Since this product is laid between subpurlins without me-chanical attachment, a nail pull requirement is not specified for thisgypsum panel product.5.1.1 Specimens shall be taken from the samples obtained inaccordance with Specification C1264.5.1.2 Flexural StrengthThe specimens s
10、hall be tested faceup and face down. The average breaking load shall be not lessthan the following:Bearing Edges AcrossFiber of Surfacing,lbf NBearing Edges Par-allel Fiber of Sur-facing, Face, lbf NBearing Edges Par-allel Fiber of Sur-facing, Back, lbf NMethod A 160 715 60 270 40 180Method B 157 70
11、0 56 250 36 1605.1.3 Humidified DeflectionThe specimens shall have anaverage deflection of not more than the following:Thickness,in. (mm)Humidified Deflection,Eighths of an in. (mm)12 12.7 10 325.1.4 Core, End, and Edge HardnessThe specimens shallhave an average hardness of 15 lbf 65 N when tested b
12、yMethod A and 11 lbf 50 N when tested by Method B.5.1.5 Resistance to FungiThe specimens shall obtain arating not more than 1 (one) when judged in accordance withPractice G21, paragraph 9.3 (“Observation for Visible Ef-fects”).1This specification is under the jurisdiction of ASTM Committee C11 onGyp
13、sum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01Specifications and Test Methods for Gypsum Products.Current edition approved Oct. 1, 2018. Published October 2018. Originallyapproved in 1953. Last previous edition approved in 2013 as C318/C318M 13.
14、DOI: 10.1520/C0318_C0318M-13R18.2For referenced ASTM standards, visit the ASTM website, www.astm.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
15、 appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Pr
16、inciples for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.16. Dimensions and Tolerances6.1 Specimens shall be taken from the samples obtained inaccordance with Section 8.6.2 Thickness, width,
17、length, and end squareness shall bedetermined in accordance with Test Methods C473.6.2.1 ThicknessThe nominal thickness shall be12 in.12.7 mm with tolerances in the nominal thickness of 6164 in.0.4 mm with local variations of 6132 in. 0.8 mm from thenominal thickness.6.2.2 WidthThe nominal width sha
18、ll be 32 in. 813 mmwith a tolerance of18 in. 3 mm over the specified width, and14 in. 6 mm under the specified width.6.2.3 LengthThe nominal length of gypsum formboardshall conform to the purlin spacing of multiples thereof, withtolerances of 614 in. 6 mm from the nominal length.6.2.4 End Squareness
19、Corners shall be square with atolerance of 618 in. 63 mm in the full width of the board.6.3 Edges and EndsThe edges and ends shall be square(90 6 10), straight, and solid.7. Finish and Appearance7.1 The surfaces of gypsum formboard shall be true and freefrom imperfections that would render it unfit
20、for use with orwithout decoration.8. Sampling, Inspection, Rejection, Certification,Packaging and Package Marking, Shipping, Handlingand Storage8.1 The sampling, inspection, rejection, certification, pack-aging and package marking, shipping, handling and storageshall be conducted in accordance with
21、Specification C1264.9. Keywords9.1 gypsum; gypsum concrete; gypsum formboard; gypsumpanel product; roof decksSUMMARY OF CHANGESCommittee C11 has identified the location of selected changes to this standard since the last issue(C318/C318M 00 (2010) that may impact the use of this standard. (Approved
22、Oct. 1, 2013.)(1) Revised 2.1 and 4.1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the r
23、iskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of t
24、his standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmak
25、e your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained b
26、y contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 13 (2018)2
