1、Designation: C 712 03Standard Test Method forBubbling of One-Part, Elastomeric, Solvent-Release TypeSealants1This standard is issued under the fixed designation C 712; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of las
2、t 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 determination of the degree ofbubble formation or surface blistering in one-part, elastomericsol
3、vent-release type sealants when exposed to elevated tem-peratures.1.2 The subcommittee with jurisdiction is not aware of anysimilar ISO standard.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 stand
4、ard 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 Building Seals and Sealants2D 1191 Test Methods for Concrete Joint Sealers33. Terminology3.1 DefinitionsRef
5、er to Terminology C 717 for definitionsof the following terms used in this test method: compound,elastomer, elastomeric, sealant, solvent-release sealant, sub-strate.4. Significance and Use4.1 The type and amount of solvent used in these sealantscan sometimes give rise to surface bubbling and bliste
6、ringproblems. The substrate used, whether porous or nonporous,will also have an effect. Although blistering is often caused bymisapplication, this test method is useful in differentiatingbetween a sealant that develops an acceptably smooth surfaceand one that may have blistering tendencies.5. Appara
7、tus5.1 Plates, thin aluminum, approximately 3 in. (76 mm)wide by 5 in. (127 mm) long by 0.012 in. (0.30 mm) thick.5.2 Blocks, cement mortar, approximately 2 in. (51 mm)wide by 4 in. (102 mm) long by 1 in. (25 mm) thick preparedas described in Test Methods D 1191.NOTE 1Other substrates such as brick,
8、 cast stone, marble, stainlesssteel, etc., may be specified either in place of the standard materialsspecified in 5.1 and 5.2 or in addition to them.5.3 Frame, flat, rectangular, of18-in. (3.2-mm) steel orbrass, with an opening of 1 by 334 in. (25 by 95 mm) andoutside dimensions of approximately 2 b
9、y 434 in. (51 by 121mm).5.4 Spatula, steel, with knife edge.5.5 Oven, forced-draft type, having a temperature controlledat 122 6 3.6F (50 6 2C).6. Test Specimen6.1 Take the test specimen from a previously unopenedcontainer as received from the sealant manufacturer.7. Procedure7.1 Prepare three test
10、specimens on each substrate as fol-lows: Center the frame on the test substrate and carefully fill itwith compound, avoiding air pockets. Strike off the surface ofthe compound flush with the frame, to a uniform thickness of18 in. (3.2 mm). With the spatula, cut all around the outsideedge of the comp
11、ound and lift the frame straight up and off.7.2 Condition the specimens for 48 h at 73.4 6 3.6F (23 62C) and 50 6 5 % relative humidity.7.3 Place the specimens in the oven at 122 6 3.6F (50 62C) for 72 h.7.4 After heat exposure, allow the specimens to cool at 73.46 3.6F (23 6 2C) for 1 h.7.5 Examine
12、 each specimen for surface gas bubbles andblisters.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. Published June 2003. Originall
13、yapproved in 1972. Last previous edition approved in 1997 as C 712 93 (1997).2Annual Book of ASTM Standards, Vol 04.07.3Discontinued. Replaced by D 5329. See 1995 Annual Book of ASTM Standards,Vol 04.03.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-29
14、59, United States.8. Report8.1 For each substrate, report the total surface area coveredby the bubbles or blisters, estimated to the nearest 0.1 in.2(65mm2). The area of bubble formation may be estimated bysuperimposing on the specimen a glass or clear plate ruled into12-in. (13-mm) squares.9. Preci
15、sion and Bias49.1 The precision and bias calculations for this test methodare based on the results of four laboratories testing threematerials using five specimens per test. The results are given inTable 1.9.1.1 At 95 % confidence level a variation of as much as0.59 in.2can be expected within a labo
16、ratory and 0.60 in.2between laboratories. This is based on three materials beingtested by four laboratories.10. Keywords10.1 bubbling; elastomeric; solvent-release sealantASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedi
17、n 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 by the responsible technical committee and mu
18、st 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 receive careful consideration at a meeting of th
19、eresponsible 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 C70
20、0, 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).4Supportin
21、g data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: C241021.TABLE 1 Precision and Bias DataMaterial AverageEstimated Stan-dard DeviationWithinLaboratoryEstimated Stan-dard DeviationBetween Lab-oratoriesRepeat-abilityIntervalRepro-ducibilityG1 0.000 0.000 0.000 0.000 0.000G2 0.064 0.209 0.212 0.590 0.600G3 0.011 0.028 0.020 0.079 0.078C712032
