ASTM D3769-2005 Standard Test Method for Microcellular Urethanes--High Temperature Sag《测试微孔氨基甲酸乙酯高温垂弛度的标准试验方法》.pdf
《ASTM D3769-2005 Standard Test Method for Microcellular Urethanes--High Temperature Sag《测试微孔氨基甲酸乙酯高温垂弛度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D3769-2005 Standard Test Method for Microcellular Urethanes--High Temperature Sag《测试微孔氨基甲酸乙酯高温垂弛度的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 3769 05Standard Test Method forMicrocellular UrethanesHigh-Temperature Sag1This standard is issued under the fixed designation D 3769; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers the procedure and apparatus formeasuring high-temperature sag of microcellular urethanematerials.1.2 The values s
3、tated in SI units are to be regarded asstandard.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 standard to establish appro-priate safety and health practices and determine the applica-bility of reg
4、ulatory limitations prior to use.NOTE 1There is no similar or equivalent ISO standard to this testmethod.2. Referenced Documents2.1 ASTM Standards:2D 3040 Practice for Preparing Precision Statements forStandards Related to Rubber and Rubber Testing3E 145 Specification for Gravity-Convection and Forc
5、ed-Ventilation OvensE 691 Practice for Conducting and Interlaboratory Study toDetermine the Precision of a Test Method3. Significance and Use3.1 This test method is used to indicate the deformationtendency of microcellular materials that may occur duringpaint application in an assembly plant operati
6、on. Since astandard specimen is used, heat sag measurements cannot beassumed to be exactly those which will occur on a part duringor after the paint application and baking operation of anassembly process.3.2 Before proceeding with this test method, referenceshould be made to the specification of the
7、 material being tested.Any test specimen preparation, conditioning, or dimensions, orcombination thereof, and testing parameters covered in thematerials specification shall take precedence over those men-tioned in these test methods. If there are no material specifi-cations, then the default conditi
8、ons apply.NOTE 2This test method is applicable to solid urethanes.4. Apparatus4.1 Test Fixture, capable of holding the specimens in a fixedcantilever position for the duration of the entire test procedure.The test fixture shall be constructed from a material such asaluminum or steel that exhibits a
9、low coefficient of linearthermal expansion and therefore allows the test fixtures heightto be considered constant through the test. See Fig. 1.4.2 Oven, conforming to the specifications for a Type IAlaboratory oven in accordance with Specification E 145.4.3 Scaled Rule, accurate to 1 mm.1This test m
10、ethod is under the jurisdiction ofASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.22 on Cellular MaterialsPlastics and Elastomers.Current edition approved November 1, 2005. Published November 2005.Originally approved in 1979. Last previous edition approved in 2000
11、as D 3769 -96(2000).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.3WithdrawnNOTE 1Not to scale.FIG. 1 Fixtu
12、re for High-Temperature Sag1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.4 Thickness Indicator, accurate to 0.03 mm.4.5 Base, a flat, smooth surface free of any su
13、rface irregu-larities that would affect the height measurements. The basemust be heat-resistant to the maximum temperature that the testfixtures will be exposed.5. Test Specimens5.1 The test specimen shall have a minimum length of 125mm, and be 25 6 1 mm in width by the nominal thickness ofthe plaqu
14、e or part. The recommended standard test specimen is4 mm in thickness. The minimum specimen thickness shall be3 mm.5.2 Three specimens to each material shall be tested.NOTE 3If test specimens are cut from parts, the specimens must becut from areas that are of constant thickness; that is, no ribs, bo
15、sses, holes,or other section changes are allowed.6. Conditioning6.1 Unless otherwise specified, condition the specimens andfixture a minimum of1hat236 2C and 50 6 5 % relativehumidity before testing.7. Procedure7.1 Measure the thickness in the clamping area of the testspecimen to the nearest 0.03 mm
16、.7.2 Clamp the specimen in the fixture with a 100 6 1mmunsupported overhang. Primed or painted surfaces are to bemounted facing up.7.3 After 5 min, measure the distance between the base andthe unsupported end of the specimen as shown in Fig. 1 andcall this Ao.7.4 Place the clamped specimen in an air
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