ASTM_C_474_-_15.pdf

Designation:C47415Standard Test Methods forJoint Treatment Materials for Gypsum Board Construction1This standard is issued under the fixed designation C474;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 jointcompound,paper joint tape,glass-mesh joint tape,and anassembly of joint compound and paper joint tape.1.1.1 Joint treatment materials are specified in SpecificationC475/C475M.1.1.2 The joint treatment material described in this standardare for use with gypsum board installed in accordance withSpecification C840.1.2 The test methods appear in the following order:SectionJoint Compound Tests:Viscosity5Shrinkage6Check Cracking7Putrefaction8Joint Tape Tests:Tensile Strength9Width10Thickness11Paper Joint Tape TestsDimensional Stability12Assemblages of Paper Joint Tape and Joint Compound:Bond of Paper Joint Tape to Joint Compound15Cracking of Joint Compound at Tape Edges14Glass-Mesh Joint Tape TestSkewness131.3 The values stated in inch-pound units are to be regardedas standard.The values given in brackets are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 The text of this standard references notes and footnotesthat provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.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 SystemsC472 Test Methods for Physical Testing of Gypsum,Gyp-sum Plasters and Gypsum ConcreteC475/C475M Specification for Joint Compound and JointTape for Finishing Gypsum BoardC840 Specification forApplication and Finishing of GypsumBoardC1396/C1396M Specification for Gypsum BoardD685 Practice for Conditioning Paper and Paper Productsfor TestingD828 Test Method for Tensile Properties of Paper andPaperboard Using Constant-Rate-of-ElongationApparatus(Withdrawn 2009)3D1000 Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and Electronic Applica-tionsD3699 Specification for KerosineD3882 Test Method for Bow and Skew in Woven andKnitted FabricsE100 Specification for ASTM HydrometersE177 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 TAPPI Standard:T 411 Thickness(Caliper)of Paper,Paperboard,and Com-bined Board43.Terminology3.1 DefinitionsFor definitions of terms relating togypsum,see Terminology C11.3.2 Definitions of Terms Specific to This Standard: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 C11.02 on Specifications and Test Methods for Accessoriesand Related Products.Current edition approved June 1,2015.Published July 2015.Originally approvedin 1961.Last previous edition approved in 2013 as C474 13.DOI:10.1520/C0474-15.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Technical Association of the Pulp and Paper Industry,Technol-ogy Park,P.O.Box 105113,Atlanta,GA 30348.*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 3.2.1 bond,nin joint systems,the quality of adhesionbetween the paper joint tape and joint compound.3.2.1.1 DiscussionA 0%bond means that no paper fiberis adhering to the joint compound.100%bond means thatthere is cohesive failure of the paper joint tape.3.2.2 check cracking,nin joint systems,short,narrowcracks randomly oriented in the surface of the dried jointcompound.3.2.3 joint compound,powder,nA drying-type or setting-type cementitious material to be mixed with water.3.2.4 joint compound,ready-mix,nA drying-type cemen-titious material that is factory mixed in ready-to-use form.4.Specimen Preparation4.1 Joint Compound,Powder:4.1.1 Mix 300 g of joint compound,powder,with approxi-mately 150 to 160 mL of water.4.1.2 Allow the specimen to stand for 30 min(Note 1),remix and adjust the temperature to 77 6 2F 25 6 1C byplacin