1、Designation: C 686 90 (Reapproved 2007)Standard Test Method forParting Strength of Mineral Fiber Batt- and Blanket-TypeInsulation1This standard is issued under the fixed designation C 686; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi
2、sion, the year of last 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 evaluation of strength in tensionon mineral fiber batt- and blanket-type in
3、sulation products. It isuseful for determining the comparative tensile properties ofthese products, specimens of which cannot be held by the moreconventional clamp-type grips. This is a quality controlmethod, and the results should not be used for design purposes.It is not normally used for board-ty
4、pe products.1.2 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 standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.
5、Referenced Documents2.1 ASTM Standards:2C 167 Test Methods for Thickness and Density of Blanketor Batt Thermal InsulationsE 171 Specification for Atmospheres for Conditioning andTesting Flexible Barrier MaterialsE 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Te
6、st Method3. Significance and Use3.1 Tensile strength is a fundamental property associatedwith mineral fiber manufacture since it is influenced by thetype of fiber, the deposition of fiber, the type and the amount ofbonding agent, and the method of curing the resin to form abonded insulation product.
7、 The test is an indication of productintegrity and the ability of the product to be successfullyhandled and applied in the field.4. Apparatus4.1 Constant Rate of Traverse Tension Test Unit of 50-lbf(223-N) capacity calibrated in increments of 0.1 lbf (0.4 N) andhaving a moving head speed of 12 in. (
8、305 mm)/min orequivalent (see Fig. 1).4.2 Post-Type Grips with 1-in. (25.4-mm) diameter rods(see Fig. 2).4.3 Die for cutting specimens (see Fig. 3). The O-ringspecimen dimensions are 3 by 4.75 in. (76 by 120.6 mm) inoutside diameter, and 1 by 2.75 in. (25 by 69.8 mm) in insidediameter (see Fig. 4).4
9、.4 Balance to weigh to an accuracy of 0.01 g.5. Test Specimen5.1 The test specimen shall consist of the entire O-ring cutfrom the full thickness of the product to be tested.5.2 Specimens shall not be cut from a product that varies inthickness 65 % from normal when tested in accordance withTest Metho
10、d C 167.5.3 No specimen shall be tested that exhibits any obviousdamage in the insulation or that shows delamination within theinsulation thickness.6. Conditioning6.1 Condition the specimens for1hinaroom maintained atatmospheric conditions of 73.4 6 1.8F (23 6 1C) and 50 62 % relative humidity in ac
11、cordance with Specification E 171.7. Procedure7.1 Weigh each specimen to the nearest 0.01 g and recordthe weight.7.2 Attach the post-type grips to the tension test unit andalign the grips in the vertical plane.7.3 Adjust the speed of the moving head to 12 in. (305mm)/min.7.4 Set the stops of the mov
12、ing head until the grips areapproximately14 in. (6.3 mm) apart in the starting position.7.5 Place the specimen on the post-type grip (higher densityside first if it is evident that such exists) so that both posts arewithin the oblong hole of the specimen. The high density sideof the specimen shall b
13、e in contact with the post shield.1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.32 on MechanicalProperties.Current edition approved May 1, 2007. Published May 2007. Originallypublished as approved in 1971. L
14、ast previous edition approved in 2001 asC 686 90 (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copy
15、right ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.6 Apply the load; read and record the maximum load tofailure to the nearest 0.1 lbf (0.4 N).7.7 Test ten specimens each cut in the machine and cross-machine directions. If the machine dire
16、ction is not readilydeterminable, refer to the longest dimension of the sample tobe tested as lengthwise and call the shortest dimension cross-wise.8. Calculation8.1 Calculate the parting strength, S, in grams per gram asfollows:S 5 L 3 453.59!/W (1)where:L = breaking load, lbf, andW = weight of spe
17、cimen, g.9. Report9.1 The report shall include the following:9.1.1 Thickness and density of the product being reported inaccordance with Test Method C 167,9.1.2 Weight and load at failure of each specimen,9.1.3 Calculated parting strength for each specimen,9.1.4 Total number of specimens tested in b
18、oth the machineand cross-machine direction, and9.1.5 Average of the parting strength in the machine andcross-machine direction.FIG. 1 Tension Test UnitFIG. 2 Post-Type GripsFIG. 3 Specimen Die CutterFIG. 4 Test SpecimenC 686 90 (2007)210. Precision and Bias310.1 PrecisionAn interlaboratory round rob
19、in involvingfour laboratories and three specimens was conducted in 1988.Specimens were tested in both machine and crossmachinedirections. The three mineral fiber samples were typical ofcurrent production. Table 1 gives the results of the round robinwhich were analyzed using Practice E 691 guidelines
20、.10.2 BiasSince there are no reference materials availablefor this test method, it is not possible to estimate bias.11. Keywords11.1 insulation; physical strength; tensile strengthASTM International takes no position respecting the validity of any patent rights asserted in connection with any item m
21、entionedin 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 committ
22、ee 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 receive careful consideration at a meet
23、ing 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 International, 100 Barr Harbor Drive, P
24、O 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).3
25、Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: 16-1013.TABLE 1 Interlaboratory PrecisionAMaterialMachine Direction Cross-Machine DirectionPartingStrength, lb/gSCV,% LSDPartingStrength, lb/gSCV,% LSDA 0.670 0.032 4.77 0.506 0.53
26、9 0.042 7.79 0.579B 1.468 0.064 4.36 0.715 1.367 0.104 7.61 0.912C 0.383 0.024 6.27 0.438 0.285 0.007 2.46 2.236AThe symbols used represent the following:S = standard deviation,CV = percent coefficient of variation (S 3 100/mean), andLSD = least significant difference between two individual test results based on a 95 % confidence level = 2 =2S .C 686 90 (2007)3
