分享
ASTM_D_2732_-_14.pdf
下载文档

ID:181716

大小:187.76KB

页数:5页

格式:PDF

时间:2023-03-04

收藏 分享赚钱
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,汇文网负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。
网站客服:3074922707
TM_D_2732_ _14
Designation:D273214Standard Test Method forUnrestrained Linear Thermal Shrinkage of Plastic Filmand Sheeting1This standard is issued under the fixed designation D2732;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 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers determination of the degree ofunrestrained linear thermal shrinkage at given specimen tem-peratures of plastic film and sheeting of 0.76 mm(0.030 in.)thickness or less.This test method does not cover shrinkagefrom loss of solvent in some materials.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered 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 standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1This standard and ISO 11501 address the same subject matter,but differ in technical content.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD1204 Test Method for Linear Dimensional Changes ofNonrigid Thermoplastic Sheeting or Film at ElevatedTemperatureE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids2.2 ISO Standard:3ISO 11501 Determination of Dimensional Change on Heat-ing3.Terminology3.1 Definitions:3.1.1 unrestrained linear thermal shrinkage(free shrink orshrinkage)the irreversible and rapid reduction in lineardimension in a specified direction occurring in film subjectedto elevated temperatures under conditions where nil or negli-gible restraint to inhibit shrinkage is present.It is normallyexpressed as a percentage of the original dimension.4.Significance and Use4.1 As a result of the manufacturing process,internalstresses may be locked into the film which can be released byheating.The temperature at which shrinkage will occur isrelated to the processing techniques employed to manufacturethe film and may also be related to a phase transition in the baseresin.The magnitude of the shrinkage will vary with thetemperature of the film.4.2 Shrinkage of a particular material produced by a par-ticular process may be characterized by this test method bymaking measurements at several temperatures through theshrinkage range of the material.4.3 Following a characterization in a particular case,it isusually sufficient thereafter to measure shrinkage at only oneselected temperature for purposes of process or quality control,or both.5.Apparatus5.1 Constant-Temperature Liquid Bath,capable of control-ling accurately to 60.5C.5.1.1 The liquid for the bath should not plasticize or reactwith the specimens.Poly(ethylene glycol),glycerin,and waterhave been found to have wide applicability.5.2 ThermometerASTM Thermometer S5C-11 conform-ing to the requirements as prescribed in Specification E2251.5.3 Square Metal Stamp,100 by 100 mm,with engravedarrow indicating machine direction of film and stamp pad andink.(The ink should not be soluble in the bath liquid.)NOTE2A metal die or template(100 by 100 mm)can be used insteadof the square metal stamp.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.19 on Film,Sheeting,andMolded Products.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 1968.Last previous edition approved in 2008 as D2732 08.DOI:10.1520/D2732-14.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.4 Free Shrink HolderA holder designed for test of asingle specimen,such as that shown in Fig.1 and Fig.2.Alternatively,a holder such as that shown in Fig.3 is capableof immersing several specimens at a time.However,checksmust be made to assure that contact among the specimens doesnot result in errors.5.5 Ruler,graduated in millimetres.6.Test Specimen6.1 The test specimen shall consist of 100 by 100-mmsamples.6.2 A minimum of two specimens is necessary for each testtemperature.7.Conditioning7.1 ConditioningConditi

此文档下载收益归作者所有

下载文档
你可能关注的文档
收起
展开