ASTM_C_972_-_00_2011.pdf

Designation:C97200(Reapproved 2011)Standard Test Method forCompression-Recovery of Tape Sealant1This standard is issued under the fixed designation C972;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.Scope1.1 This test method describes a laboratory procedure fordetermining compression-recovery characteristics of tape seal-ant.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 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.NOTE1There are no ISO standards similar or equivalent to thisASTM standard.2.Referenced Documents2.1 ASTM Standards:2C717 Terminology of Building Seals and Sealants3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology C717.4.Significance and Use4.1 Tape sealants are tacky,deformable solids used undercompression between two or more surfaces of similar ordissimilar materials in a variety of sealing applications.Thisprocedure presents an indication of the compression recoverycharacteristics of preformed tapes.5.Apparatus5.1 Glass Plates,two,each 6.35 by 76.2 by 76.2 mm(0.25by 3 by 3 in.).5.2 Steel Panels,two,cold-rolled,each 0.762 by 76.2 by76.2 mm(0.03 by 3 by 3 in.).NOTE2Substitutes such as aluminum,acrylic,acrylonitrile-butadiene-styrene(ABS),may be substituted for the plates(5.1)andpanels(5.2).5.3 Compression Testing Machine,with a cross-head speedof 50 mm(2 in.)/min and capable of stopping at specifiedsettings.NOTE3Load values may differ when determined on screw-typeversus spring-type test machines due to a drift past the desired stop in thespring-type machine.It may be necessary to use shims to obtain thedesired stop.5.4 Recorder,for recording compression loads in newtons(or pounds-force).5.5 Stop Watch,measuring in minutes and seconds.5.6 Gage or Rule,capable of measuring tape thickness to0.025 mm or 0.001 in.6.Test Specimen and Sample6.1 Conditioning:6.1.1 Condition the specimens for 24 h at 23 6 2C(73.4 63.6F)and 506 10%relative humidity.6.1.2 Other conditioning parameters may be included asdesired.6.2 Samples to be tested shall be taken from a roll or tapesealant after first removing and discarding approximately thefirst 0.6 m(2 ft)of the roll.6.3 Tape sealant configuration should be approximately 9.53by 9.53 by 76.2 mm(0.375 by 0.375 by 3 in.).The sampleshould be re-extruded rather than plied to conform to thespecified size if the sample does not approximate thesedimensions.6.4 Total tape volume(V)should be calculated(width bylength by thickness)for determination of tape sealant compres-sion index.6.5 Prepare two test specimens for each sample as follows:6.5.1 Do not clean or unnecessarily handle the surfaces ofsurface-treated or painted plate or panels.6.5.2 Clean plates or panels with detergent or solvent,orboth.1This test method is under the jurisdiction ofASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.20 onGeneral Test Methods.Current edition approved June 1,2011.Published August 2011.Originallyapproved in 1982.Last previous edition approved in 2006 as C972 00(2006).DOI:10.1520/C0972-00R11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.5.3 Place two 76.2 by 9.53 by 9.53-mm(3 by 0.375 by0.375-in.)lengths of tape sealant on one of the plates or panels,as shown in Fig.1,and remove the release paper.Place thesecond plate or panel over the tape sealant to complete the testspecimen in accordance with Fig.1.7.Procedure7.1 Place the specimen in a laboratory press or equivalentequipment,and compress the specimen at 51 mm(2 in.)/minuntil the sealant tape thickness is 5.1 mm(0.20 in.).Maintainthe compression mode for exactly 1 min,recording maximumcompressive load in newtons or pounds force.At the end of 1min,raise the press crosshead and remove the specimen,takingcare not to disturb the specimen.7.2 After removing the specimen from the press,measureand record the tape sealant thickness after 5 min and after2 h.8.Calculations8.1 Calculate the compression load and recovery height foreach specimen as follows:R15 T12 5.1 mm0.200 in.!(1)where:R1=free recovery height after 5 min,andT1=tape thickness after 5 min.R25 T22 5.1 mm0.200 in.!(2)where:R2=free recove