ASTM_D_3833_-_D_3833M_-_96_2011.pdf

Designation:D3833/D3833M96(Reapproved 2011)Standard Test Method forWater Vapor Transmission of Pressure-Sensitive Tapes1This standard is issued under the fixed designation D3833/D3833M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers one procedure for measuringthe water vapor transmission rate of pressure-sensitive tape.1.2 The values stated in either SI or inch-pound units are tobe regarded separately as standard.The values stated in eachsystem may not be exact equivalents;therefore,each systemmust be used independently,without combining values in anyway.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.2.Referenced Documents2.1 ASTM Standards:2D996 Terminology of Packaging and Distribution Environ-mentsD3715/D3715M Practice for Quality Assurance of Pressure-Sensitive TapesD4332 Practice for Conditioning Containers,Packages,orPackaging Components for TestingE96/E96M Test Methods for Water Vapor Transmission ofMaterialsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or Process3.Terminology3.1 DefinitionsGeneral terms in this test method are de-fined in Terminology D996.4.Summary of Test Method4.1 The pressure-sensitive tape is secured by its adhesive toa test cup containing a desiccant.The assembly is exposed toa controlled atmosphere and weighed after two intervals of thatexposure.The gain in weight is used to calculate the watervapor transmission rate(WVTR).5.Significance and Use5.1 The results of this test method will indicate the relativepermeability by water vapor of the tape through its smallestdimension(generally normal to the tapes backing).5.1.1 The pathway for the water vapor parallel to theadhesive-cup interface is great compared to the tapes thick-ness and the latter is usually the nearly exclusive source oftransmitted vapor.5.1.2 Some tape types allow a relatively free path in adirection normal to the backing or along backing pathwaysparallel to the adhesive-cup interface allowing the adhesive tobecome the principal barrier.5.2 If the adhesive does not continue to adhere to the cupflange during the exposure periods allowing unintended path-ways for water vapor to occur,the measurement should beconsidered as not having been made.Consequently,the tapemight be considered as being inappropriate for use on surfaceslike the cup flange under moisture conditions approximatingthose of the test.NOTE1It may be that the interest is simply in the tape material as awater vapor barrier.In this case,how well the tape adheres to the cupflange may be of little consequence,and steps to prevent any edge effectsare in order.These are referred to in Section 10.6.Apparatus6.1 Test Cups,3made from materials that are nonhygro-scopic.The cup shall have a zero WVTR.The cups shall berectangular with a flat,smooth,rigid flange,and shall have thefollowing dimensions:1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommittee D10.14 on Tape andLabels.Current edition approved Aug.1,2011.Published November 2011.Originallyapproved in 1979.Last previous edition approved in 2006 as D3833/D3833M 96(2006).DOI:10.1520/D3833_D3833M-96R11.2For 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 sole source of supply of the apparatus known to the committee at this timeis Chemsultants International,9349 Hamilton Dr.,Mentor,OH 440611118.If youare aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Flange:Outside50.8 by 152.4 0.5 mm 2.0 by 6.0 0.02 in.Inside(opening)25.4 by 101.6 0.5 mm 1.0 by 4.0 0.02 in.Body:Inside25.4 by 101.6 by 38.1(depth)0.5 mm 1.0 by 4.0 by 1.5(depth)0.02 in.The mass shall not exceed 80%of the balance capacity usedin weighing.6.2 Calcium Chloride,anhydrous,passing a No.8(2.36-mm)sieve.NOTE2Regenerate calcium chloride to a sufficiently anhydrous stateby heating it for 2 h at approximately 200C 392F.6.3 Test Chamber,controlled at 90 to 95%relative hum