ASTM_C_473_-_16.pdf

Designation:C47316Standard Test Methods forPhysical Testing of Gypsum Panel Products1This standard is issued under the fixed designation C473;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 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These test methods cover the physical testing of gypsumpanel products.1.2 The test methods appear in the following order:SectionFlexural Strength(Method A)7Core,End and Edge Hardness(Method A)8Nail Pull Resistance(Method A)9Flexural Strength(Method B)11Core,End and Edge Hardness(Method B)12Nail Pull Resistance(Method B)13Humidified Deflection14End Squareness15Nominal Thickness16Recessed-or Tapered Edge Depth17Width18Length19Water Resistance of Core-Treated Water-RepellentGypsum Panel Products20Surface Water Resistance of Gypsum Panel Productswith Water-Repellent Surfaces211.3 The values stated in inch-pound units are to be regardedas standard with the exception of weight of samples in SI gramunits.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 The text of these test methods references notes andfootnotes that provide explanatory material.These notes andfootnotes,excluding those in tables and figures,shall not beconsidered as requirements of these test methods.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsE4 Practices for Force Verification of Testing MachinesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Standards:3TAPPI T441 Water Absorptiveness of Sized(Non-Bibulous)Paper,Paperboard,and Corrugated Fiberboard(CobbTest)3.Terminology3.1 Definitions used in these test methods are in accordancewith Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 edge,nthe paper-bound edge,or long edge,asmanufactured.3.2.2 ends,nthe end perpendicular to the paper-boundedge or long edge.3.2.3 Test Uncertainty Ratio(TUR),n(tolerance of mea-sure)/(precision of the standard measuring instrument)4.Sampling4.1 For use in these test methods,a sample shall consist ofnot less than 0.25%of the number of gypsum panel productsin a shipment,but not less than three gypsum panel products.Test specimens shall be taken from the sample lot as indicatedin each method.1These test methods are under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and are the direct responsi-bility of Subcommittee C11.01 on Specifications and Test Methods for GypsumProducts.Current edition approved Nov.1,2016.Published December 2016.Originallyapproved in 1961.Last previous edition approved in 2015 as C473 15.DOI:10.1520/C0473-16.2For 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.3Available from Technical Association of the Pulp and Paper Industry(TAPPI),15 Technology Parkway South,Norcross,GA 30092,http:/www.tappi.org.*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 5.Conditioning5.1 Condition specimens to constant weight at a temperatureof 85 6 15F(29.5 6 8.5C)and relative humidity of 50 62%(Note 1).Test specimens individually after constantweight is reached and within 10 min upon removal from theconditioning chamber.NOTE1Laboratory test results indicated that conditioning tempera-tures may range from 70 to 100F(21 to 38C)without significantlyaffecting the results.However,relative humidity is critical.This is thereason for testing specimens within 10 min upon removal from theconditioning chamber.Method AConstant Rate of LoadingINTRODUCTIONThe following procedures are applicable to so-called“shotmachines”that utilize lead or steel shot that applies a load tothe specimen at a constant stress rate or any other device thatapplies the load at a constant stress rate.6.ApparatusMethod A6.1 Testing MachineApply the test load at a uniform rateof 1 lbf/s(4.45 N/s)610%.Apply the load with a deviceindependent of manual control of the rate of loading during anindividual sample test(see Fig.1).The deformation of thespecimen controls the cross head speed.7.Flexural Strength(Method A)7.1 Summary of Te