ASTM_D_5948_-_05_2012.pdf

Designation:D594805(Reapproved 2012)Standard Specification forMolding Compounds,Thermosetting1This standard is issued under the fixed designation D5948;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 the basic properties of thermo-set molding compounds and the test methods used to establishthe properties.1.2 ClassificationMolding thermosetting plastic com-pounds shall be of the following resins and are covered by theindividual specification sheets(see 5.1 and Annex A1 AnnexA8).ResinPhenolic,cellulose filledPhenolic,mineral/glass filledMelaminePolyesterDiallyl iso-phthalateDiallyl ortho-phthalateSiliconeEpoxyNOTE1There is no equivalent ISO standard.1.3 Order of PrecedenceIn the event of a conflict betweenthe text of this specification and the references cited in Section2(except for related specification sheets),the text of thisspecification takes precedence.Nothing in this specification,however,supersedes applicable laws and regulations unless aspecific exemption has been obtained.1.4 The values stated in SI units are to be consideredstandard.2.Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD229 Test Methods for Rigid Sheet and Plate MaterialsUsed for Electrical InsulationD256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD495 Test Method for High-Voltage,Low-Current,Dry ArcResistance of Solid Electrical InsulationD570 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 PositionD695 Test Method for Compressive Properties of RigidPlasticsD790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD796 Practice for Compression Molding Test Specimens ofPhenolic Molding Compounds(Withdrawn 1992)3D883 Terminology Relating to PlasticsD1896 Practice for Transfer Molding Test Specimens ofThermosetting CompoundsD3419 Practice for In-Line Screw-Injection Molding TestSpecimens From Thermosetting CompoundsD3636 Practice for Sampling and Judging Quality of SolidElectrical Insulating MaterialsD3638 Test Method for Comparative Tracking Index ofElectrical Insulating MaterialsD4350 Test Method for Corrosivity Index of Plastics andFillersD4697 Guide for Maintaining Test Methods in the UsersLaboratory(Withdrawn 2009)3E994 Guide for Calibration and Testing Laboratory Accredi-tation Systems General Requirements for Operation andRecognition(Withdrawn 2003)3E1224 Guide for Categorizing Fields of Capability for Labo-ratory Accreditation Purposes(Withdrawn 2002)31This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.16 on ThermosettingMaterials.Current edition approved Oct.1,2012.Published November 2012.Originallyapproved in 1996.Last previous edition approved in 2005 as D5948-051.DOI:10.1520/D5948-05R12.2For 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.*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 2.2 Underwriters Laboratory Standard:4UL 94 Tests for Flammability of Plastic Materials for Partsin Devices and Appliances2.3 Other Standard:DDC AD 297457 Procedure for Determining Toxicity ofSynthetic Compounds53.Terminology3.1 For definitions of technical terms pertaining to plasticsused in this specification,refer to Terminology D883.3.2 Definitions of Terms Specific to This Standard:3.2.1 batcha homogeneous unit of finished molding com-pound manufactured at one time.3.2.2 heat resistancethe elevated temperature at which aparticular material retains a minimum of 50%of its originalflexural strength measured at 23C.4.Significance and Use4.1 This specification is a revision of STD MIL-M-14H,Specification for Molding Compound,Thermosetting,retain-ing the MIL-M-14H material designations and property re-quirements while conforming to ASTM form and style.It isintended for qualification and batch acceptanc