1、Designation: C 772 03Standard Test Method forOil Migration or Plasticizer Bleed-Out of Preformed TapeSealants1This standard is issued under the fixed designation C 772; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a laboratory procedure that canbe used to determine the oil migration or plasticizer bleed-outo
3、f preformed tape sealants.1.2 The values stated in acceptable metric units are to beregarded as the standard. The values given in parentheses arefor information only.1.3 The subcommittee with jurisdiction is not aware of anysimilar ISO standard.1.4 This standard does not purport to address all of th
4、esafety 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:C 717 Terminology of Buildin
5、g Seals and Sealants2D 2203 Test Method for Staining from Sealants2E 145 Specification for Gravity-Convection and Forced-Ventilation Ovens33. Terminology3.1 DefinitionsThe definitions of the following terms usedin this test method are found in Terminology C 717: preformedtape sealant, sealant.4. Sum
6、mary of Test Method4.1 The preformed tape sealant to be tested is placed onfilter paper. The specimen is heat aged and examined formigration into the filter paper.5. Significance and Use5.1 Preformed tape sealants are tacky, deformable solidsthat are used under compression between two substrates in
7、avariety of sealing applications. In general, oil migration orplasticizer bleed-out is not desirable. However, in some limitedinstances, a controlled amount of plasticizer migration issometimes desired in order to improve the penetration of thetape into the interstices of porous substrates. This tes
8、t methodis designed to indicate whether or not a preformed tape sealantexhibits oil or plasticizer migration and, if so, to what extent.6. Apparatus6.1 Vented Air Circulating Oven, that complies with Speci-fication E 145 and is capable of aging samples at 70 6 2C(158 6 3.6F) or 100 6 2C (212 6 3.6F)
9、.6.2 Filter Paper,4six sheets, high-grade, rapid, 76 mm (3in.) in diameter.6.3 Weight, 1 kg (2.2 lb).7. Sampling7.1 Select a fresh roll of preformed tape sealant at least 13mm (0.5 in.) wide and 3 mm (0.125 in.) thick. Remove asection of preformed tape sealant approximately 61 cm (2 ft)long from the
10、 roll and discard it.8. Test Specimens8.1 Prepare duplicate test specimens by cutting short lengthsof preformed tape sealant with the release paper still in placeand plying them together to form a solid pad having theminimum surface dimensions of 38 mm (1.5 in.) by 38 mm and3 mm (0.125 in.) thick.8.
11、2 Place each pad of preformed tape sealant on a piece offilter paper with the release paper side up.8.3 Ensure adequate contact between the preformed tapesealant and the filter paper on each specimen by placing the1-kg (2.2-lb) weight on top of the preformed tape sealant for 5s.9. Procedure9.1 Place
12、 two additional pieces of filter paper under each ofthese test specimens.1This test method is under the jurisdiction of ASTM Committee C24 on BuildingSeals and Sealants and is the direct responsibility of Subcommittee C24.20 onGeneral Sealant Standards.Current edition approved May 10, 2003. Publishe
13、d June 2003. Originallyapproved in 1974. Last previous edition approved in 1997 as C 772 97.2Annual Book of ASTM Standards, Vol 04.07.3Annual Book of ASTM Standards, Vol 14.04.4This test method was based on the use of Whatman No. 1 filter paper. The solesource of supply of the apparatus known to the
14、 committee at this time is WhatmanInc., 9 Bridewell Place, Clifton, NJ 07014. If you are aware of alternative suppliers,please provide this information to ASTM Headquarters. Your comments will receivecareful consideration at a meeting of the responsible technical committee,1whichyou may attend.1Copy
15、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.9.2 Place each of these tape-filter paper assemblies in an aircirculating oven maintained at 70 6 2C (158 6 3.6F) andcondition them for 3 weeks at this temperature. (Alternatively,samples ca
16、n be conditioned for 1 week at 100 6 2C (212 63.6F).9.3 Examine the filter papers under each specimen forevidence of oil migration or plasticizer bleed-out as soon aspossible after removal from the oven. The filter paper should beviewed from the back side when held up to a light.10. Report10.1 Repor
17、t the following information:10.1.1 Identification of the preformed tape sealant, that is,the name, lot number, and any other identifying characteristics.10.1.2 Oven aging conditions used for this test.10.1.3 For each specimen, number of filter papers stained orthat show evidence of oil migration.10.
18、1.4 For each specimen, to the nearest 0.3 mm (0.01 in.)the average distance of the stain from the edge of the pad oftape on the filter paper that was in direct contact with the padof tape compound.10.1.5 For each specimen, whether there is any evidence ofstain, oil migration, or plasticizer bleed-ou
19、t on the first filterpaper directly under the pad of tape compound.NOTE 1Care should be taken not to confuse the changes in filter papercolor or opacity due to being in direct contact with the tape with evidenceof oil migration or plasticizer bleed-out.10.2 A stain index can be determined for any on
20、e specimenby adding the average distance of the stain and the number offilter papers stained. (See Test Method D 2203.)11. Precision and Bias11.1 Two round robins were conducted using this procedureand a variation wherein ultraviolet lights were also used as aheat source. Different laboratories show
21、ed excellent compara-tive results when ranking the relative oil migration of tapesamples using this type of procedure.12. Keywords12.1 oil migration; plasticizer bleed; preformed tape seal-ants; tapes; tape sealantsASTM International takes no position respecting the validity of any patent rights ass
22、erted in connection with any item mentionedin this standard. 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 b
23、y 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 should be addressed to ASTM International Headquarters. Your comments will rece
24、ive 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 Standards, at the address shown below.This standard is copyrighted by ASTM Inte
25、rnational, 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).C772032
