ASTM_F_735_-_17.pdf

Designation:F73517Standard Test Method forAbrasion Resistance of Transparent Plastics and CoatingsUsing the Oscillating Sand Method1This standard is issued under the fixed designation F735;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method determines the resistance of transpar-ent plastics and transparent coatings utilized in windows orviewing ports,to surface abrasion using oscillating sand.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionThe inch-pound units in parentheses areprovided for information only.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.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C136 Test Method for Sieve Analysis of Fine and CoarseAggregatesD618 Practice for Conditioning Plastics for TestingD1003 Test Method for Haze and Luminous Transmittanceof Transparent PlasticsE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 The test method consists of measuring and recording thehaze and light transmission of a test specimen,mounting thespecimen so that it forms part of the bottom tray(sand cradle),covering the specimen with abrading media,and subjecting thecradle to a specific number of oscillations.After exposure tothe abrasion,the haze and light transmission are remeasured todetermine any change in these values.3.2 At the stroke velocity specified in this test method,theentire mass of sand shifts significantly within the sand cradlebecause of its inertia;therefore the relative motion betweensand and specimen at the interface is large.3.3 The thickness or height of the sand resting on top of thetest specimen remains relatively constant during the motion ofthe cradle.Therefore,the average pressure of the sand alsoremains constant,giving highly reproducible results over theentire surface of the test specimen.3.4 The degree of abrasion is measured by the amount ofchange in luminous transmission and haze after exposure to thetest.4.Significance and Use4.1 Plastic materials,when used as transparencies,covers,or enclosures,are subject to wiping,cleaning,or other types ofrubbing actions that cause abrasion.It is the intent of this testmethod to provide a means of estimating the resistance of suchmaterials to this type and degree of abrasion.5.Apparatus5.1 AbraderThe abrader consists of a specimen holder,sand cradle,drive mechanism,and counter.One such exampleis shown in Fig.1.5.1.1 The specimen holder shall have a cutout approxi-mately 100 by 100 mm(4 by 4 in.)to receive the specimen.Alternative specimen holders can be used to test other speci-men sizes as long as they can be used within the testinglimitations defined in this test method.5.1.2 The specimen holder forms the bottom of the sandcradle.1This test method is under the jurisdiction of ASTM Committee F07 onAerospace and Aircraft and is the direct responsibility of Subcommittee F07.08 onTransparent Enclosures and Materials.Current edition approved June 1,2017.Published July 2017.Originally approvedin 1981.Last previous edition approved in 2011 as F735 11.DOI:10.1520/F0735-17.2For 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.*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 5.1.3 The sand cradle shall be approximately 250 250 50 mm(10 10 2 in.),with the sides set at an angle of 60.5.1.4 A drive mechanism shall provide 300 strokes perminu