ASTM_D_4802_-_16.pdf

Designation:D480216Standard Specification forPoly(Methyl Methacrylate)Acrylic Plastic Sheet1This standard is issued under the fixed designation D4802;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 specification covers monolithic methacrylate sheetsproduced by various processes.For this specification,meth-acrylate sheet shall be composed of polymerized acrylicmonomers of which at least 80%shall be methyl methacrylate.NOTE1This specification is intended to consolidate the requirementsof the Cast Methacrylate Plastic Sheets portion of discontinued Fed.Spec.L-P-391D,discontinued Specification D702.Cast Methacrylate PlasticSheets,Rods,Tubes and Shapes,and discontinued Specification D1547,Extruded Acrylic Plastic Sheet.1.2 This specification is intended to cover acrylic sheet forgeneral-purpose applications.For specialty applications con-sult the appropriate use standards.1.3 The following safety hazards caveat pertains only to thetest methods portion,Section 8,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.1.4 Acrylic sheet is used frequently in applications in whichextreme clarity,lack of optical distortion and absence of anyforeign particulate matter are of primary significance.Re-ground material is suitable for use as long as careful control isused to eliminate adverse effects on these properties.The use ofrecycled material in type B-1 and B-2 sheet,is not suitable foruse when these properties are adversely affected.The use ofrecycled or reground material is not possible for type A-1 andA-2 materials since the sheet is produced directly frommonomerNOTE2This standard and ISO 7823-1 address the same subjectmatter,but differ in technical content.2.Referenced Documents2.1 ASTM Standards:2D256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD542 Test Method for Index of Refraction of TransparentOrganic PlasticsD570 Test Method for Water Absorption of PlasticsD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD648 Test Method for Deflection Temperature of PlasticsUnder Flexural Load in the Edgewise PositionD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD1003 Test Method for Haze and Luminous Transmittanceof Transparent PlasticsD1044 Test Method for Resistance of Transparent Plastics toSurface AbrasionD1308 Test Method for Effect of Household Chemicals onClear and Pigmented Organic FinishesD3002 Guide for Evaluation of Coatings Applied to Plastics(Withdrawn 2016)3D3359 Test Methods for Measuring Adhesion by Tape TestD3892 Practice for Packaging/Packing of PlasticsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 ISO Standard:ISO 7823-1(E)PlasticsPoly(Methyl Methacrylate)SheetsTypes,Dimensions,and Characteristics43.Terminology3.1 Definitions:1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved May 1,2016.Published May 2016.Originallyapproved in 1988.Last previous edition approved in 2015 as D4802 15.DOI:10.1520/D4802-16.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available 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 3.1.1 GeneralThe definitions given in Terminology D883are applicable to this specification.3.2 Definitions of Terms Specific to This Standard:3.2.1 bow warp,ndistortion in the form of a simple curveor arc extending across the sheet and displaced from thehorizontal when the sheet is laying flat.3.2.2 edge kink warpage,ndistortion in the form of atwist,wrinkle,or scallop occurring along the perimeter of thesheet.3.2.3“S”warp,ndistortion in the form of a compoundcurve or“S”shape caused by a nonuniform change in internalstresses.4.Classification4.1 Categories:4.1.1 Category