1、Designation:D 673 93ae1Standard Test Method forMar Resistance of Plastics1This standard is issued under the fixed designation D 673;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 ind
2、icates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.e1NOTESection 13,Keywords,was added editorially in February 1995.1.Scope1.1 This test method
3、covers the determination of the resis-tance of plastics to surface marring caused by falling abrasiveparticles.Materials such as films,molded,or laminated plasticsmay be evaluated.1.2 A surface to be tested should be relatively flat andsmooth;the damage done by a falling object is a function of thea
4、ngle at which it strikes.Since deterioration is usually mea-sured optically,the material evaluated is normally of highinitial gloss or low initial haze.1.3 In other than flat form,materials may be comparedvisually.Care must be exercised to use the same shape ofspecimen throughout and to have the abr
5、asive fall on the samearea at the same angle.1.4 The values stated in SI units are to be regarded as thestandard.1.5 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 safet
6、y and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE1There is no similar or equivalent ISO standard.2.Referenced Documents2.1 ASTM Standards:D 523 Test Method for Specular Gloss2D 618 Practice for Conditioning Plastics and ElectricalInsulating Materials
7、 for Testing3D 1003 Test Method for Haze and Luminous Transmittanceof Transparent Plastics3D 2457 Test Method for Specular Gloss of Plastic Films andSolid Plastics4D 4000 Classification System for Specifying Plastic Mate-rials43.Summary of Test Method3.1 A series of abraded spots is made on the surf
8、ace of thetest specimen.Increasing amounts of abrasive material aredropped from a fixed height.3.2 The change in gloss produced by the abrasive actionmay be determined optically for plastics with high initial gloss.The haze of abraded transparent materials is measured andcompared with the haze origi
9、nally present.4.Significance and Use4.1 This test method provides a relatively mild particle-impingement type of abrasive action where hard sharp particlesimpact and tumble along a materials surface creating a groupof gouges or pits.There is usually an accompanying loss ofwear debris from the sample
10、.The test best simulates situationswhere airborne particulates abrade a materials surface duringactual use.Different materials may be ranked in terms of theirrelative resistance over a range of test severities.4.2 For many materials,there may be a specification thatrequires the use of this test meth
11、od,but with some proceduralmodifications that take precedence when adhering to thespecification.Therefore,it is advisable to refer to that materialspecification before using this test method.Table 1 of Classi-fication D 4000 lists the ASTM materials standards that cur-rently exist.5.Apparatus55.1 Ab
12、rader,consisting of a tube fitted with a rotatablehopper,as shown in Fig.1.5.1.1 Tube,glass,metal,or plastic(A,Fig.1),supportedvertically,through which abrasive is dropped a distance of 635mm on a test specimen supported at an angle of 45 to the axisof the tube.The tube shall conform to the dimensio
13、ns shown inFig.2.5.1.2 Hopper(B,Fig.1),to distribute the abrasive and1This test method is under the jurisdiction ofASTM Committee D-20 on Plasticsand is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.Current edition approved Oct.15,1993.Published December 1993.Originallypu
14、blished as D 673 42.Last previous edition D 673 93.In 1970,the obsolete gloss method previously used was deleted.Currentprocedures for determining gloss and haze are specified in 9.4 and 9.5.2Annual Book of ASTM Standards,Vol 06.01.3Annual Book of ASTM Standards,Vol 08.01.4Annual Book of ASTM Standa
15、rds,Vol 08.02.5Complete working drawings of an apparatus that meets the requirements of thistest method are obtainable from ASTM Headquarters.Request Adjunct No.12-406730-00.One such apparatus is the CS-269 Mar Tester,available from CustomScientific Instruments(CSI),13 Wing Dr.,Cedar Knolls,NJ 07927
16、.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMNOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.produce on the specimen a uniformly abraded spot about 20mm in diameter.The hopper shall be rotated at about 7 rpm andfeed abrasive at 200 to 250 g/min.Details of construction ofthe hopp
