ASTM_D_1790_-_14.pdf

Designation:D179014Standard Test Method forBrittleness Temperature of Plastic Sheeting by Impact1This standard is issued under the fixed designation D1790;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 the determination of thattemperature at which plastic sheeting 1.00 mm(0.040 in.)orless in thickness exhibits a brittle failure under specified impactconditions.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.NOTE1This test method was developed jointly with the Society of thePlastics Industry,primarily for use with plasticized vinyl sheetings.Itsapplicability to other plastic sheetings must be verified by the user.1.3 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.NOTE2This test method and ISO 8570 address the same subjectmatter,but differ in technical content.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensD6988 Guide for Determination of Thickness of Plastic FilmTest SpecimensE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 8570 PlasticsFilm and SheetingDetermination ofCold-Crack Temperature33.Terminology3.1 Definitions:3.1.1 brittleness temperature,Tbthat temperature,derivedstatistically,where 80%of the specimens would probably pass95%of the time when a stated minimum number are tested bythis test method.The 80%-passing value is determined byplotting the data on probability graph paper,as described in9.1.3.1.2 GeneralDefinitions of terms applying to this testmethod appear in Terminology D883.4.Significance and Use4.1 Data obtained by this test method have been used topredict the behavior of plastic sheeting at low temperaturesonly if the conditions of deformation are similar to thosespecified in this test method.This test method is useful forspecification testing and for comparative purposes,but doesnot necessarily determine the lowest use temperature for aparticular plastic.4.2 It has been demonstrated that on calendered sheeting thebrittleness temperature is sensitive to the direction of fold.Ithas also been demonstrated that the brittleness temperature issensitive to the direction of sampling.Therefore,it is impera-tive that the procedure for taking specimens and folding befollowed explicitly.5.Apparatus5.1 Cold Conditioning Chamber,at least 450 by 450 by 450mm(18 by 18 by 18 in.).Means(automatic or manual)shall beprovided for controlling the temperature of the chamber towithin 62C of the desired value.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.30 on Thermal Properties.Current edition approved Oct.1,2014.Published October 2014.Originallyapproved in 1960.Last previous edition approved in 2008 as D1790-08.DOI:10.1520/D1790-14.2For 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 5.2 Impact Tester shown in Fig.1 shall be constructed ofcold-rolled steel except for the bolts,screws,and rubberstopper.It is recommended that all structural parts(that is,base,anvil,arm,arm supports,and shaft)be chromium platedto prevent corrosion.The arm,including the rubber stopper andbolt,shall weigh 3.09 kg 6 28 g(6 lb 13 6 1 oz).5.3 Die,50.8 6 0.4 mm by 146.1 6 0.4 mm(2 6164in.by5346164in.)to cut the test specimens from the sample.5.4 Stapler,desk-type,with a stop mounted on the baseexactly 12.7 mm(12in.)back of the center of the groover thatturns the staple.5.5 Index Card Stock,50 by 127 mm(2 by 5 in.).5.6 Thickness GaugeA dead-weight dial or digital mi-crometer as described in D5947 or D6988 as appropriate forthe material or specimen geometry being tested.6.Test Specimens6.1 The test specimens shall be cut with the die.The lengthof the test specimen shall be parallel to the transverse directionof the sheet