1、Designation: C 318/C 318M 00 (Reapproved 2005)Standard Specification forGypsum Formboard1This standard is issued under the fixed designation C 318/C 318M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A
2、 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. 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.2. Referenced Documents2.1 ASTM Standards:2C11 Terminology Re
5、lating to Gypsum and Related Build-ing Materials and SystemsC 473 Test Methods for Physical Testing of Gypsum PanelProductsC 1264 Specification for Sampling, Inspection, Rejection,Certification, Packaging, Marking, Shipping, Handling andStorage of Gypsum BoardG21 Practice for Determining Resistance
6、of SyntheticPolymeric 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, essentially gypsum, containing not more than 15 % byweigh
7、t of fiber, either mineral 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 TestMethods C 473.NOTE 1Since this product is laid between subpurlins without me-chanical attac
8、hment, 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 C 1264.5.1.2 Flexural StrengthThe specimens shall be tested faceup and face down. The average breaking load shall be not lessthan the
9、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 157 700 56 250 36 1605.1.3 Humidified DeflectionThe specimens shall have anaverage deflection o
10、f 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 byMethod A and 11 lbf 50 N when tested by Method B.5.1.5 Resistance to FungiThe specimens
11、shall obtain arating not more than 1 (one) when judged in accordance withPractice G21, paragraph 9.3, (Observation for Visible Effects).6. Dimensions and Tolerances6.1 Specimens shall be taken from the samples obtained inaccordance with Section 8.6.2 Thickness, width, length, and end squareness shal
12、l bedetermined in accordance with Test Methods C 473.6.2.1 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.1This specification is under the jurisdiction of ASTM Committe
13、e C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 Specifications and Test Methods for Gypsum Products.Current edition approved May 1, 2005. Published June 2005. Originallyapproved in 1953. Last previous edition approved in 2000 as C 318/
14、C 318M 00.2For 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.1*A Summary of Changes section appears at the end o
15、f this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2.2 WidthThe nominal width shall 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 nomin
16、al 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 SquarenessCorners 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 squa
17、re(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 for use with orwithout decoration.8. Sampling, Inspection, Rejection, Certification,Packaging and Package Marking, Shipping, Handlingand S
18、torage8.1 The sampling, inspection, rejection, certification, pack-aging and package marking, shipping, handling and storageshall be conducted in accordance with Specification C 1264.9. Keywords9.1 gypsum; gypsum concrete; gypsum formboard; gypsumpanel product; roof decksSUMMARY OF CHANGESCommittee
19、C11 has identified the location of selected changes to this specification since the last issue,C 318/C 318M 96, that may impact the use of this specification. (Approved July 10, 2000)(1) SI values in paragraphs 5.1.2 and 5.1.4 were rationalized tothe nearest 5N.ASTM International takes no position r
20、especting 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 riskof infringement of such rights, are entirely their own responsibility.Thi
21、s 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 this standard or for additional standardsand should be addressed to ASTM Inte
22、rnational 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 shouldmake your views known to the ASTM Committee on Standards, at the address shown
23、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 by 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).C 318/C 318M 00 (2005)2
