1、Designation:C22/C22M00(Reapproved 2015)Standard Specification forGypsum1This standard is issued under the fixed designation C22/C22M;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses in
2、dicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers gypsum,calcium sulfate com-bined with two molecules of water in crystalline form andhaving the approximate chemical formula CaSO42H2O.1.2
3、 The values stated in either inch-pound units or SI(metric)are to be regarded separately as the standard.Withinthe text,the SI units are shown in brackets.The values statedin each system shall be used independently of the other.Valuesfrom the two systems shall not be combined.1.3 The text of this sp
4、ecification references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the specification.2.Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMat
5、erials and SystemsC471M Test Methods for ChemicalAnalysis of Gypsum andGypsum Products(Metric)C472 Test Methods for Physical Testing of Gypsum,Gyp-sum Plasters and Gypsum Concrete3.Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C11.4.Chemical Composition4.1 Gypsum shall
6、 contain not less than 70.0 weight percentCaSO42H2O.4.2 The chemical composition,within the limits prescribedby 4.1,shall be specified in the purchase order or contract.5.Physical Properties5.1 SizeIf necessary,gypsum shall be crushed or ground,or both,to the size specified in the purchase order.6.S
7、ampling6.1 BulkWhen gypsum is shipped in bulk,samples ofapproximately 5 lb 2 kg each shall be taken at regularintervals during the complete loading or unloading of thecarrier,in such a way as to accumulate not less than 200 lb 90kg of material and to represent correctly the percentages ofboth the co
8、arse particles and the fines in the shipment.Thismaterial shall be broken to pass a 1-in.25.0-mm sieve,thoroughly mixed,and reduced by quartering to provide notless than a 1-lb 0.5-kg sample for the laboratory.6.2 PackagesWhen gypsum is shipped in packages,notless than 1%of the packages shall be sam
9、pled.Samples shallbe taken from both the surface and the center of the packages.These samples shall then be broken,mixed,and quartered inaccordance with 6.1.6.3 Laboratory SamplesEach laboratory sample shall beplaced immediately in an airtight container and shipped to thelaboratory for testing.7.Tes
10、t Methods7.1 The chemical composition of gypsum shall be deter-mined in accordance with Test Methods C471M.7.2 The physical properties of gypsum shall be determinedin accordance with Test Methods C472.8.Inspection8.1 Inspection of the gypsum shall be agreed upon betweenthe purchaser and the supplier
11、 as part of the purchase agree-ment.9.Rejection9.1 Rejection of gypsum that fails to conform to therequirements of this specification shall be reported to theproducer or supplier promptly and in writing.The notice ofrejection shall contain a statement documenting how thegypsum has failed to conform
12、to the requirements of thisspecification.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved Oct.
13、1,2015.Published October 2015.Originallyapprovedin1919.Lastpreviouseditionapprovedin2010asC22/C22M 00(2010).DOI:10.1520/C0022_C0022M-00R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume inf
14、ormation,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 C700,West Conshohocken,PA 19428-2959.United States1 10.Certification10.1 When specified in the purchase
15、agreement,a manufac-turers or suppliers report shall be furnished at the time ofshipment certifying that the product is in compliance with thisspecification.11.Packaging and Package Marking11.1 Gypsum shall be shipped either in packages or in bulk.11.2 When shipped in packages for resale,the followi
16、nginformation(See Note 1)shall be legibly marked on eachpackage or on a tag of suitable size attached thereto:11.2.1 Name of manufacturer,11.2.2 Description of material,and11.2.3 Net or gross weights,or both,of the package.11.3 When shipped in bulk,a card containing the requiredinformation in accordance with 11.2 shall be conspicuouslyplaced in the carrier.NOTE1State law may require additional information.12.Keywords12.1 calcium sulfate;gypsumASTM International takes no position respecting the v
