1、Designation:C90815Standard Test Method forYield Strength of Preformed Tape Sealants1This standard is issued under the fixed designation C908;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 parent
2、heses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a laboratory procedure fordetermining the yield strength of preformed tape sealants.1.2 The values stated in acceptable metric unit
3、s are to beregarded as the standard.The values given in parentheses arefor information only.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 practice
4、s 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 Refer to Terminology C717 for definitions of
5、the fol-lowing terms used in this test method:adhesive failure;cohesive failure;elongation;modulus;primer;standard condi-tions;substrate;and tape sealant.4.Significance and Use4.1 Tape sealants are tacky,deformable solids that are usedunder compression between two or more surfaces of similar ordissi
6、milar materials in a variety of sealing applications.Thisprocedure is not intended to simulate an actual use conditionbut will give some indication of the cohesive and adhesivebonding properties of the tape.It also provides an indication ofthe modulus and tensile strength of the sealant tape composi
7、-tion.5.Apparatus5.1 Glass Plates,two,each 6.35 by 76.2 by 76.2 mm(14by3 by 3 in.).NOTE2Other substrates such as aluminum,acrylic,ABS,etc.,may besubstituted for the plates(5.1)and panels(5.2).5.2 Steel Panels,two,cold-rolled,each 0.762 by 76.2 by76.2 mm(0.03 by 3 by 3 in.)(Note 2).5.3 Laboratory Pre
8、ss,or equivalent.5.4 Tension Testing Machine,or equivalent,with a jawseparation rate of 25 mm(1 in.)/min.5.5 Recorder,for recording the tension load in pascals(orpounds-force).5.6 Rule.5.7 Spacers,5.1 by 5.1 by 76.2 mm(0.20 by 0.20 by 3 in.).6.Sampling6.1 Take samples to be tested taken from a fresh
9、 roll of tapesealant after first removing and discarding approximately thefirst 0.61 m(2 ft)of the roll.6.2 Sealant tape configuration should be 9.53 by 9.53 mm(38by38in.).If the sample does not approximate thesedimensions,the sample should be re-extruded rather than pliedup to conform to the specif
10、ied size.7.Test Specimens7.1 Prepare two test specimens per sample as follows:7.1.1 Clean the glass plates with a suitable solvent,such asmethyl ethyl ketone.7.1.2 Clean the steel plates with a suitable solvent,such asmethyl ethyl ketone.NOTE3If the steel panels have been painted or prepared with ot
11、herspecified surface treatments,omit this cleaning procedure.NOTE4Primers may be used.7.1.3 Place two 76.2 by 9.53 by 9.53-mm(3 by38by38-in.)lengths of tape on one of the steel plates,located as shown inFig.1,and remove the release paper.Place a spacer outboardof each tape.Place a glass plate over t
12、he tape to complete thetest specimen assembly in accordance with Fig.1.7.1.4 Compress the assembly at 51 mm(2 in.)/min bymeans of a laboratory press,or equivalent,until the tape sealantthickness is 5.1 mm(0.20 in.),and maintain this compression1This test method is under the jurisdiction ofASTM Commi
13、ttee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.30 onAdhesion.Current edition approved Dec.1,2015.Published January 2016.Originallyapproved in 1979.Last previous edition approved in 2011 as C90800(2011).DOI:10.1520/C0908-15.2For referenced ASTM standards,v
14、isit 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.Uni
15、ted States1 mode for 1 min.At the end of 1 min raise the press and removethe assembly,taking care not to disturb it.8.Conditioning8.1 Condition the specimens for 24 h at standard conditions.8.2 Other conditioning parameters may be included asdesired.9.Procedure9.1 Record the average width of the con
16、tact area of the tapeto the plate glass as measured to the nearest 1.0 mm(132in.).9.2 Place the test assembly into the jaws of the tensiontesting machine(Fig.2).9.3 Pull the test assembly apart at a jaw separation speed of25 mm(1 in.)/min(Fig.3)until the sealant has failed.9.4 Record the peak tension load in newtons(or pounds-force).9.5 Record the modulus at the desired elongation levels.9.6 Record the type of sealant tape failure,either cohesiveor adhesive.9.7 In the event of an adhesive failur
