ASTM C879-2003(2009) Standard Test Methods for Release Papers Used With Preformed Tape Sealants《与预制密封带一同使用的脱模纸的标准试验方法》.pdf

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1、Designation: C 879 03 (Reapproved 2009)Standard Test Methods forRelease Papers Used with Preformed Tape Sealants1This standard is issued under the fixed designation C 879; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of

2、 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 These test methods cover laboratory procedures forevaluating the release characteristics of a release paper in-tended

3、 to be supplied in direct contact with a preformed tapesealant.1.2 The values stated in metric (SI) units are to be regardedas the standard. The values given in parentheses are providedfor information purposes only.1.3 The subcommittee with jurisdiction is not aware of anysimilar ISO standard.1.4 Th

4、is standard does not purport to address all of thesafety concerns associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM St

5、andards:2C 717 Terminology of Building Seals and Sealants3. Terminology3.1 DefinitionsThe definitions of the following terms usedin this test method are found in Terminology C 717: preformedtape sealant, sealant.4. Summary of Test Method4.1 The preformed tape sealant is placed between two stripsof r

6、elease paper supplied with the preformed tape sealant.Duplicate samples are rolled with a standard roller. One sampleis heat aged in an oven, the other is heat aged in a humiditychamber. The release paper is peeled off of the preformed tapesealant either at ambient or elevated temperature. The relea

7、sepaper is examined for transfer or residue of the preformed tapesealant.5. Significance and Use5.1 Preformed tape sealants are tacky, deformable solidsthat are used under compression between two substrates invarious sealing applications. These tapes are usually suppliedin roll form with a release p

8、aper interlayer. When the roll isunwound and the release paper is removed from the preformedtape sealant, there should be no transfer of the preformed tapesealant to the release paper, nor any residue left on the paper.These methods will give a qualitative indication of whether ornot the release pap

9、er can be removed cleanly from a preformedtape sealant after a controlled exposure period.5.2 Alternative procedures are listed because some pre-formed tape sealants are normally used under field conditionswhere elevated temperatures can be encountered, while otherpreformed tape sealants are normall

10、y used under more con-trolled environments in “assembly line” operations.6. Apparatus and Accessory Materials6.1 Hard Rubber Roller, weighing 2043 g (4.5 lb), withapproximate dimensions of 82.5-mm (3.25-in.) diameter and63.5-mm (2.5-in.) width. The rubber surface is 6.4 mm (0.25in.) thick and has a

11、durometer hardness value of 75 6 5.6.2 Oven, forced-draft, set at 70 6 2C (158 6 3.5F) or 506 2C (122 6 3.5F).6.3 Humidity Chamber, set at 41 6 2C (105 6 3.5F) and100+0,2%relative humidity.6.4 Weight, 1000-g (2.2-lb).7. Sampling7.1 Samples to be tested shall be taken from a fresh roll ofpreformed ta

12、pe sealant, after first removing and discardingapproximately the first 600 mm (2 ft) of the roll.8. Test Specimens8.1 Prepare two test specimens as follows:1These test methods are under the jurisdiction of ASTM Committee C24 onBuilding Seals and Sealants and are the direct responsibility of Subcommi

13、tteeC24.20 on General Test Methods.Current edition approved Jan. 1, 2009. Published March 2009. Originallyapproved in 1978. Last previous edition approved in 2003 as C 87903.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For

14、Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8.1.1 Place a 152-mm (6-in.) length of preformed tapesealant between two

15、 strips of release paper that is supplied withthe preformed tape sealant. Apply light finger pressure on therelease papers to ensure alignment of the preformed tapesealant.8.1.2 Pass the 2043-g (4.5-lb) roller over the length of thepreformed tape sealant sample three times to ensure adequatecontact.

16、9. Conditioning9.1 Condition one test specimen for 14 days at 70 6 2C(158 6 3.5F) in a forced-draft oven.9.1.1 Condition the duplicate specimen for 14 days at 41 62C (1056 3.5F) and 100 + 0, 1 % relative humidity in aconstant-humidity chamber.9.2 Remove the specimens and allow them to condition for1

17、hat236 2C (73.46 3.6F) and 50 6 10 % relativehumidity.10. Procedures10.1 Alternative A, Ambient-Temperature TestingLift ap-proximately 25 mm (1 in.) of the release paper from each sideof the 152-mm (6-in.) length of preformed tape sealantspecimen at one end and fold back 180. Place the 1000-g(2.2-lb

18、) weight on the exposed portion of the tape to hold it inplace while the two strips of release paper are simultaneouslypeeled from the preformed tape sealant compound at an angleas close as practical to 180 to the preformed tape sealantsurface (see Fig. 1).10.2 Alternative B, Elevated-Temperature Te

19、stingPlaceboth specimens in a forced-draft oven set at 506 2C (122 63.6F). After 1 h and while still in the oven at 50C (122F),perform the release paper peeling procedure described in 10.1.10.3 Visually examine the specimens for transfer or residueof the tape compound to the release paper.11. Report

20、11.1 Report the following information:11.1.1 Identification of the preformed tape sealant, that is,the name, lot number and any other identifying characteristics.11.1.2 The alternative procedure used and the test tempera-ture.11.2 If any transfer or residue of preformed tape sealant isobserved.12. P

21、recision and Bias12.1 Three round robins were conducted using AlternativeProcedureA. Different laboratories showed excellent compara-tive results when evaluating a wide variety of tapes suppliedwith different release papers. One test was conducted usingAlternative Procedure B and again a good correl

22、ation of resultswas obtained.13. Keywords13.1 preformed tape sealant; release paper; tape sealants;tapesFIG. 1 Release Paper Peeling ProcedureC 879 03 (2009)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standa

23、rd. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewe

24、d every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible

25、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 Standards, 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).C 879 03 (2009)3