1、Designation:C77103 (Reapproved 2009)C77114 Standard Test Method for Weight Loss After Heat Aging of Preformed Tape Sealants 1 This standard is issued under the xed designation C771; the number immediately following the designation indicates the year of original adoption or, in the case of revision,
2、the year of last revision.Anumber in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval. 1. Scope 1.1 This test method covers a laboratory procedure for determining the weight loss after heat aging of preform
3、ed tape sealants. NOTE 1Test Method C681 describes a weight loss or volatility test for knife-grade glazing compounds. 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
4、 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 appropriate safety and health practices and determine the applicability of regulato
5、ry limitations prior to use. 2. Referenced Documents 2.1 ASTM Standards: 2 C681Test Method for Volatility of Oil- and Resin-Based, Knife-Grade, Channel Glazing Compounds C717Terminology of Building Seals and Sealants E145Specication for Gravity-Convection and Forced-Ventilation Ovens 3. Terminology
6、3.1 DenitionsTheFor denitions of the following terms used in this test method are found in method, see Terminology C717: preformed tape sealant, sealant. . 4. Summary of Test Method 4.1 The preformed tape sealant to be tested is placed on a tared metal plate and weighed. After heat aging, the specim
7、en is weighed again. The difference in weight indicates the volatile content of the tape sealant. 5. Signicance 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. Compared to other types of sea
8、lants, that is, gunnable sealants and caulks, sealing tapes are designed to be essentially 100% solids materials. In use, these tapes are intended to give long service with minimal weight loss or volatility. This procedure will give a measure of the weight loss of a preformed tape sealant after a co
9、ntrolled period of exposure at an elevated temperature. 6. Apparatus 6.1 Balance, calibrated to weigh specimens to the nearest 0.01 g. 6.2 Thin Plates of Aluminum or Other Metal, two, not less than 51 mm (2 in.) wide by 152 mm (6 in.) long, for each tape to be tested. 1 This test method is under the
10、 jurisdiction ofASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on General Test Methods. Current edition approved Jan. 1, 2009Jan. 1, 2014. Published March 2009January 2014. Originally approved in 1974. Last previous edition approved in 20032
11、009 as C77103.C77103 (2009). DOI: 10.1520/C0771-03R09.10.1520/C0771-14. 2 ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatserviceastm.org.For Annual Book ofASTM Standards volume information, refer to the standards Document Summary page on the ASTM website. T
12、his document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editi
13、ons as appropriate. In all cases only the current version of the standard as published by ASTM is to be considered the official document. Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 16.3 Vented Air Circulating Oven, that complies
14、with Specication E145 and is capable of aging samples at 1006 2C (2126 3.6F). 7. Sampling 7.1 Use a fresh roll of preformed tape sealant for testing. Remove a section of preformed tape sealant approximately 61 cm (2 ft) long from the roll and discard. 7.2 Remove release paper as required in order to
15、 fashion a suitable test specimen. 8. Procedure 8.1 For each preformed tape sealant to be tested, prepare two test specimens as follows: 8.1.1 Clean and dry two metal plates, weightweigh them, and record the tare weight for each to the nearest 0.01 g. 8.1.2 Cut the preformed tape sealant into 127-mm
16、 (5.0-in.) lengths. Ply strips together to form on each specimen plate a solid block of preformed tape sealant not less than 38 mm (1.5 in.) wide by 3 mm (0.12 in.) thick by 127 mm (5.0 in.) long. 8.1.3 WeightWeigh the plates with the preformed tape sealant on them, subtract the tare weights of the
17、plates, and plates; determine and record the initial net weight for each test specimen to the nearest 0.01 g. 8.2 Place both specimens in an air circulating oven preset to 1006 2C (2126 3.6F) and condition them for 1 week at this temperature. 8.3 After conditioning, remove the specimens from the ove
18、n and allow them to cool at room temperature for 1 h. 8.4 Reweigh each specimen to the nearest 0.01 g and record. 8.5 Subtract the respective tare weights of the plates from the weight of the specimens to determine the net weight of the tape specimen after heat aging, and record these weights to the
19、 nearest 0.01 g. 9. Calculation 9.1 For each specimen, determine the weight loss of the preformed tape sealant by subtracting the net weight of the preformed tape sealant after heat aging from its initial net weight. 9.2 Calculate the percent weight loss for each test specimen by dividing the weight
20、 loss by the initial net weight of the tape specimen times 100. 10. Report 10.1 Identication of the preformed tape sealant, that is, the name, lot number, and any other identifying characteristics. 10.2 Report the average of at least two weight loss calculations for each sample tested. 11. Precision
21、 and Bias 11.1 Interlaboratory round-robin testing of the weight loss of various sealing tapes has determined the 2 s or 95% condence level of precision for the preformed tape sealant weight loss test. 11.2 The interlaboratory or multioperator precision for preformed tape sealants that show less tha
22、n 3% total weight loss is 60.5%. 11.3 The interlaboratory or multioperator precision for preformed tape sealants that show greater than 3% total weight loss is 61.0%. 12. Keywords 12.1 preformed tape sealants; tapes; tape sealants; weight loss; weight loss after heat aging ASTM International takes n
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24、onsibility. Thisstandardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteeandmustbereviewedeveryveyearsand ifnotrevised,eitherreapprovedorwithdrawn.Yourcommentsareinvitedeitherforrevisionofthisstandardorforadditionalstandards and should be addressed toASTM International Headquarters.Your
25、 comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. This standard is co
26、pyrighted byASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959, United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above address or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website (www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/ COPYRIGHT/). C77114 2
