ASTM_D_3816_-_D_3816M_-_96_2012.pdf

Designation:D3816/D3816M96(Reapproved 2012)Standard Test Method forWater Penetration Rate of Pressure-Sensitive Tapes1This standard is issued under the fixed designation D3816/D3816M;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 provides one procedure for measuringthe water penetration rate of 2-in.or wider pressure-sensitivetape.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 equivalent;therefore,each system must beused independently,without combining values in any way.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 TestingE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or Process3.Terminoloy3.1 Definitions General terms in this test method aredefined in Terminology D996.4.Summary of Test Method4.1 The pressure-sensitive tape to be tested is secured by itsadhesive to a test cup containing a desiccant.The assembly isweighed,then reweighed following submersion under a speci-fied head of water for a specified period of time.The gain inweight is used to calculate the water penetration rate.5.Significance and Use5.1 The results of this test method will indicate the relativepermeability by water of the tape through its smallest dimen-sion(generally normal to the tapes backing).5.1.1 The pathway for the water parallel to the adhesive-cupinterface is great compared to the tapes thickness and the latteris usually the nearly exclusive source of transmitted water.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 to occur,the measurement should be consideredas not having been made.Consequently,the tape might beconsidered as being inappropriate for use on surfaces like thecup flange under moisture conditions approximating those ofthe test.NOTE1It may be that the interest is simply in the tape material as awater barrier.In this case how well the tape adheres to the cup flange maybe of little consequence and steps to prevent any edge effects are 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 water vapor transmission rate(WVTR).The cups shall be rectangular with a flat,smooth,rigid flange and shall have the following dimensions: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.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 April 1,2012.Published May 2012.Originallyapproved in 1979.Last previous edition approved in 2007 as D3816 96(2007).DOI:10.1520/D3816_D3816M-96R12.2For 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 The mass shall not exceed 80%of the balance capacity usedin weighing.6.2 Desiccant,calcium chloride,anhydrous,passing a No.82.36-mm sieve.NOTE2Regenerate calcium chloride to a sufficiently anhydrous stateby heating it for 2 h at approximately 392F 200C.6.3 Water ContainerAny vessel allowing for sufficientwater depth to cover the tes