ImageVerifierCode 换一换
格式:PDF , 页数:3 ,大小:81.62KB ,
资源ID:179979      下载积分:14 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。 如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【https://www.wnwk.com/docdown/179979.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: QQ登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ASTM_D_3769_-_15.pdf)为本站会员(益****师)主动上传,蜗牛文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知蜗牛文库(发送邮件至admin@wnwk.com或直接QQ联系客服),我们立即给予删除!

ASTM_D_3769_-_15.pdf

1、Designation:D376915Standard Test Method forMicrocellular UrethanesHigh-Temperature Sag1This standard is issued under the fixed designation D3769;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in pa

2、rentheses indicates the year of last reapproval.Asuperscript epsilon()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 stated in SI u

3、nits 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 regulatory limitati

4、ons prior to use.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2D3040 Practice for Preparing Precision Statements for Stan-dards Related to Rubber and Rubber Testing(Withdrawn1987)3E145 Specification for Gravity-Convection and Forced-Ventilation Oven

5、sE691 Practice for Conducting an 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 operation.Since astandard spe

6、cimen is used,do not assume heat sag measure-ments to be exactly those which will occur on a part during orafter the paint application and baking operation of an assemblyprocess.3.2 Before proceeding with this test method,reference shallbe made to the specification of the material being tested.Anyte

7、st 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 materialspecifications,then the default conditions apply.NOTE2This test method is ap

8、plicable 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 low coefficient of linearthermal expansi

9、on 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 E145.4.3 Scaled Rule,accurate to 1 mm.4.4 Thickness Indicator,accurate to 0.03 mm.4.5 Base,a fl

10、at,smooth surface free of any surface 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

11、nominal thickness ofthe plaque 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.NOTE3If test specimens are cut from parts,the specimens must be cutfrom areas that are of constant thickn

12、ess;that is,no ribs,bosses,holes,orother section changes are allowed.6.Conditioning6.1 Unless otherwise specified,condition the specimens andfixture a minimum of 1 h at 23 6 2C and 50 6 10%relativehumidity before testing.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsan

13、d is the direct responsibility of Subcommittee D20.22 on Cellular Materials-Plastics and Elastomers.Current edition approved Sept.1,2015.Published September 2015.Originallyapproved in 1979.Last previous edition approved in 2010 as D3769-10.DOI:10.1520/D3769-15.2For referenced ASTM standards,visit th

14、e 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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes

15、 section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Procedure7.1 Measure the thickness in the clamping area of the testspecimen to the nearest 0.03 mm.7.2 Clamp the specimen in the fixture with a

16、100 6 1 mmunsupported 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-circulating oven atthe test temperature of 120 6 1C for 60 6 1 min.7.5 After oven aging,remove the fixture with the specimenfrom the oven.7.6 After 5 min,repeat the measurement as in 7.3 for Aoandcall this distance Af.NOTE4Other combinations of te

copyright@ 2008-2023 wnwk.com网站版权所有

经营许可证编号:浙ICP备2024059924号-2