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ASTM C772-03(R2019) pdf free download

ASTM C772-03(R2019) pdf free download.Standard Test Method for Oil Migration or Plasticizer Bleed-Out of Preformed Tape Sealants
1. Scope
1.1 This test method covers a laboratory procedure that can be used to determine the oil migration or plasticizer bleed-out of preformed tape sealants. 1.2 The values stated in acceptable metric units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 The subcommittee with jurisdiction is not aware of any similar ISO standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Test Method
4.1 The preformed tape sealant to be tested is placed on filter paper. The specimen is heat aged and examined for migration into the filter paper.
5. Significance and Use
5.1 Preformed tape sealants are tacky, deformable solids that are used under compression between two substrates in a variety of sealing applications. In general, oil migration or plasticizer bleed-out is not desirable. However, in some limited instances, a controlled amount of plasticizer migration is sometimes desired in order to improve the penetration of the tape into the interstices of porous substrates. This test method is designed to indicate whether or not a preformed tape sealant exhibits oil or plasticizer migration and, if so, to what extent.
6. Apparatus
6.1 Vented Air Circulating Oven, that complies with Speci- fication E145 and is capable ofaging samples at 70 6 2°C (158 6 3.6°F) or 100 6 2°C (212 6 3.6°F). 6.2 FilterPaper, 3 six sheets, high-grade, rapid, 76 mm (3 in.) in diameter. 6.3 Weight, 1 kg (2.2 lb).
7. Sampling
7.1 Select a fresh roll of preformed tape sealant at least 13 mm (0.5 in.) wide and 3 mm (0.125 in.) thick. Remove a section of preformed tape sealant approximately 61 cm (2 ft) long from the roll and discard it.
8. Test Specimens
8.1 Prepare duplicate test specimens by cutting short lengths of preformed tape sealant with the release paper still in place and plying them together to form a solid pad having the minimum surface dimensions of38 mm (1.5 in.) by 38 mm and 3 mm (0.125 in.) thick. 8.2 Place each pad of preformed tape sealant on a piece of filter paper with the release paper side up. 8.3 Ensure adequate contact between the preformed tape sealant and the filter paper on each specimen by placing the 1-kg (2.2-lb) weight on top of the preformed tape sealant for 5 s.
9. Procedure
9.1 Place two additional pieces of filter paper under each of these test specimens. 9.2 Place each of these tape-filter paper assemblies in an air circulating oven maintained at 70 6 2°C (158 6 3.6°F) and condition them for 3 weeks at this temperature. (Alternatively, samples can be conditioned for 1 week at 100 6 2°C (212 6 3.6°F). 9.3 Examine the filter papers under each specimen for evidence of oil migration or plasticizer bleed-out as soon as possible after removal from the oven. The filter paper should be viewed from the back side when held up to a light.
10. Report
10.1 Report 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 offilter papers stained or that show evidence of oil migration. 10.1.4 For each specimen, to the nearest 0.3 mm (0.01 in.) the average distance of the stain from the edge of the pad of tape on the filter paper that was in direct contact with the pad of tape compound. 10.1.5 For each specimen, whether there is any evidence of stain, oil migration, or plasticizer bleed-out on the first filter paper directly under the pad of tape compound. N OTE 1—Care should be taken not to confuse the changes in filter paper color or opacity due to being in direct contact with the tape with evidence of oil migration or plasticizer bleed-out. 10.2 A stain index can be determined for any one specimen by adding the average distance of the stain and the number of filter papers stained. (See Test Method D2203.)

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