ASTM D3833 D3833M-1996(2006) Standard Test Method for Water Vapor Transmission of Pressure-Sensitive Tapes《压敏带水蒸气透过性的标准试验方法》.pdf

1、Designation: D 3833/D 3833M 96 (Reapproved 2006)Standard Test Method forWater Vapor Transmission of Pressure-Sensitive Tapes1This standard is issued under the fixed designation D 3833/D 3833M; the number immediately following the designation indicates theyear of original adoption or, in the case of

2、revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) 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 meth

3、od 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 independ

4、ently, 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 regulator

5、y limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 996 Terminology of Packaging and Distribution Environ-mentsD 3715/D 3715M Practice for Quality Assurance ofPressure-Sensitive TapesD 4332 Practice for Conditioning Containers, Packages, orPackaging Components for TestingE 96/E 96

6、M Test Methods for Water Vapor Transmission ofMaterialsE 122 Practice for Calculating Sample Size to Estimate,With a Specified Tolerable Error, the Average for aCharacteristic of a Lot or Process3. Terminology3.1 DefinitionsGeneral terms in this test method aredefined in Terminology D 996.4. Summary

7、 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. Signifi

8、cance 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-ne

9、ss 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

10、 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

11、 moisture conditions approximatingthose of the test.NOTE 1It 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 t

12、o in Section 10.6. Apparatus6.1 Test Cups,2made 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:Flange:Outside50.8 by 152.4 6 0.5mm2.0by6.06 0.02 in.Inside (opening)25.4 by

13、 101.6 6 0.5mm1.0by4.06 0.02 in.Body:Inside25.4 by 101.6 by 38.1 (depth) 6 0.5 mm 1.0 by 4.0 by 1.5 (depth) 60.02 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

14、1, 2006. Published April 2006. Originallyapproved in 1979. Last previous edition approved in 2001 as D 3833/D 3833M 96(2001).2The 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 alter

15、native 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1942

16、8-2959, United States.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.NOTE 2Regenerate calcium chloride to a sufficiently anhydrous stateby heating it for2hatapproximately 200C 392F.6.3 Test Chamber, controlled a

17、t 90 to 95 % relative humid-ity at 38 6 1C 100.0 6 2.0F. The air shall be circulatedwithin the chamber to provide uniform conditions for allspecimens and shall give no visible condensation on the testcups.6.4 Balance, accurate to 61 mg.7. Sampling7.1 Acceptance SamplingSampling shall be in accordanc

18、ewith Practice D 3715/D 3715M.7.2 Sampling for Other PurposesThe sampling and thenumber of test specimens depends on the purpose of thetesting. Practice E 122 is recommended. It is common to test atleast five specimens of a particular tape. Test specimens shouldbe taken from several rolls of tape an

19、d wherever possible,among several production runs of a tape. Strong conclusionsabout a specific property of a tape cannot be based on testresults of a single unit (roll) of a product.8. Test Specimens8.1 Prepare three specimens for each sample or sample roll.8.2 Specimens shall be 50 minus 2.5 mm 2.

20、0 minus 0.1 in.wide and 155 minus 2.5 mm 6.0 minus 0.2 in. long from thesample material.8.3 When the sample material is pressure-sensitive tapewound in roll form, unwind and discard at least three, but nomore than six, outer wraps of tape from the sample roll beforetaking specimens for testing.8.4 R

21、emove specimens from a freely rotating roll at the rateof 500 to 750 mm 20 to 30 in./s. Where width or other factorscausing high adherence to backing make it impossible toremove the specimens at the prescribed rate, remove it at a rateas close to 20 in. 500 mm/s as possible.9. Conditioning9.1 Weigh

22、in the standard conditioning atmosphere as de-scribed in Practice D 4332.10. Procedure10.1 Prepare each specimen assembly individually.10.2 Fill the test cup to within approximately 3 mm 18 in.of the opening with the anhydrous calcium chloride and makesure it will not come into contact with the adhe

23、sive of thespecimen.10.3 Apply the specimen to the flange, adhesive against it,allowing no bubbles or wrinkles. Use finger pressure to achievethis. When the sample material is larger than the specimendimension trim it to the edges of the flange.10.3.1 When the adhesive is lacking or has insufficient

24、bonding strength to the flange to maintain a seal during theexposure period, and when the parties concerned are interestedexclusively in the barrier properties for pathways normal to thesurface of the tape backing, a sealing material such asaluminum foil-backed pressure-sensitive tape can provideass

25、urance that only the 25.4 by 101.6-mm 1.0 by 4.0-in. areaat the flange opening is exposed and all edges are covered.10.4 Prepare the remaining assemblies in the same way asthe first.10.5 Place the assemblies into the test chamber for approxi-mately a 24-h period, remove, cool for 15 min to the weigh

26、ingconditions, and weigh to the nearest 5 mg. This will be W1forthe equation in Section 11.10.5.1 For materials with an expected WVTR of 40g/m22.5 g/100 in.2 in 24 h or less, return the assemblies tothe test chamber for 72 h following the initial weighing.Remove and cool them to the weighing conditi

27、ons for 15 minand weigh again to the nearest 5 mg. Use this as W2for theequation in Section 11.10.5.2 For materials with an expected WVTR greater than40 g/m22.5 g/100 in.2 in 24 h, return the assemblies to thetest chamber for 48 h. Remove, cool, and weigh them as in10.5.1 to obtain W2.NOTE 3For tape

28、s of unknown WVTR, return the assemblies to thetest chamber for 48 h following the initial weighing. Remove, cool, andweigh as in 10.5.1 to obtain W2. Again, return the assemblies to the testchamber for another 48 h. Remove, cool, and weigh them as in 10.5.1 toobtain a second W2. Use the previously

29、obtained W2as W1in the equationin Section 11. Continue these 48-h exposure periods and reweighings untila steady-state WVTR is determined.11. Calculation11.1 Calculate the water vapor transmission rate (WVTR)for each specimen in g/m2g/100 in.2 of tape area in 24 h tothe nearest 0.05 g as follows:WVT

30、R 5W22 W1! 2400T 3 A(1)where:W1= weight from 10.5,g,W2= weight from 10.5.1 or 10.5.2,g,T = time of exposure between W1and W2,h,andA = area of cup opening, m2(0.00258 m2) in.2.12. Report12.1 The report shall include the following:12.1.1 Statement that this test method was used. Indicateany deviations

31、 from this test method as written.12.1.2 Whether the edges were sealed or unsealed.12.1.3 Manufacturers name and designation for the tape.12.1.4 Report the results found in Section 11 as the averageand the standard deviation. Report the number of samples.13. Precision and Bias313.1 Precision:13.1.1

32、An interlaboratory evaluation of two types ofpressure-sensitive tape by four laboratories has been con-ducted. The following summary presents the standard devia-tions as percentages of the mean. These may be larger or3Supporting data are available from ASTM International Headquarters. RequestRR: D-1

33、0-1002, Report 2.D 3833/D 3833M 96 (2006)2smaller for any particular tape type or any particular manufac-turer. Careful treatment of outliers (individual extreme datum)may reduce the reported measures of precision.Residual (within roll and replication error) 25.1 %Between rolls (of one tape type) 2.

34、1 %Between people (testers in one laboratory) 19.7 %Between laboratories 5.7 %13.1.2 These deviations may be combined in several waysto obtain the desired estimate of precision. Since the repeat-ability (within-laboratory replication error) can be determinedby a laboratory for a particular tape, thi

35、s information can beused with the reported information to obtain more meaningfulestimates of precision.13.2 BiasNo measure of bias is possible with this testmethod because an accepted reference or referee value is notavailable.14. Keywords14.1 pressure-sensitive tape; water vapor transmissionASTM In

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37、ly their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand s

38、hould be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on S

39、tandards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 3833/D 3833M 96 (2006)3