MGM7001M aterial.docx
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MGM7001M aterial.docx
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MGM7001Material
Material
SpecificationGM7001M
Plastics
PlasticMoldingCompounds
1Scope
Thisstandardprovidesasystemforspecifyingsignif-icantpropertiesofcommonlyusedplastics,includingunpigmentedandpigmented,unfilledandfilledprod-ucts.Itisintendedtoapplytoresins(notparts),pri-marilyasusedintheautomotiveandrelatedindus-tries.Itisalsointendedtobeusedeitherasthesoledescriptorofamaterialorwithinthebodyofaspecifi-cationcoveringthecommonstandardcharacteristicsrequiredwhereasadditionalspecializedrequirementsaredetailed.
1.1MaterialDescription.Itisbasedontheprin-ciplethatplasticsshouldbedescribed,insofarasispossible,intermsofspecificperformancecharacter-isticsdesiredintheresin,andthataninfinitenumberofsuchdescriptionscanbeformulatedbytheuseofoneormorestandardstatements(basedonstandardtests),eachdesignatingaqualitylevelofapropertyorcharacteristic.Thus,usersofplasticresincan,byselectingdifferentcombinationsofperformancechar-acteristic,specifydifferentcombinationsofpropertiesdesiredinvariousresins.
CompoundProperties.SeeTable1.
Table1:
Properties
SuffixCharacteristic
Symbol
AResinType
BReinforcementand/orFiller
DSpecificGravity
EViscosity
FMeltPoint
GMoistureContent
HOxidativeStability
JHardness
KTensileStrength
LElongation
MFlexuralModulus
SuffixCharacteristic
Symbol
NFlexuralStrength
PStiffness
QCompressiveStrength
RImpactStrength
SDeflectionTemperature
TBrittlenessTemperature
UFlammability
VFogging
WHeatResistance
XHumidityAging
YWeatherResistance
ZOtherCharacteristics
Note:
SuffixSymbolsAthroughHarenormallyap-plicabletotheresinasreceived.SuffixSymbolsJthroughUarenormallyapplicabletotestspecimensmoldedfromtheresinasreceived.SuffixSymbolsVthroughZcoveringenvironmentalperformancere-quirementsarealsonormallyapplicabletotestspec-imensmoldedfromtheresinasreceived.
ResinDescription.Theresindescriptionshallbeasindicatedbythenumeral(s)followingthesuffixA-sym-bol(seeTable2).One
(1)ormoresuffixsymbolsmaybeusedtodescribetherequiredresins.
Example:
A3,A42=Aheatstabilized,copolymerresin.
Table2:
ResinDescription
DesignationCharacteristic
1Alloy
2Blend
3Copolymer
4GeneralPurpose/
Homopolymer
©CopyrightJune2001GeneralMotorsCorporationAllRightsReserved
OriginatingDepartment:
NorthAmericanEngineeringStandards,RecordsandDocumentation
June2001Page1of11
GM7001MGMENGINEERINGSTANDARDS
DesignationCharacteristic
70ColdRunner
71Rim
DesignationCharacteristic
5ImpactModified
6SingleStage
7Transparent
8TwoStage
9Reprocessed
20Flake
21Liquid
22Pellet
23Powder
24Sheet
25Rope
26Bulk
27Granular
40BlowingAgent
41Fungicide
42HeatStabilizer
43Lubricated
44NucleatingAgent
45Plasticizer
46UVStabilized
47Reinforcementand/orFiller
60BlowMolding
61Coating
62Extrusion
63Foaming
64InjectionMolding
65Plating
66Rotocasting
67SlushMolding
68CompressionMolding
69TransferMolding
DesignationReinforcement/Filler
AGlassFibers
BGlassFibers(Coupled)
CGlassSpheres(Solid)
DGlassSpheres(Hollow)
EAsbestosFibers
FCarbonFibers
GGraphite
HWoodFlour
JMineralFiller
KCalciumCarbonate
LTalc
MCarbonBlack
NMolybdenumDisulfide
PCottonFlock
RSisal
TDimethylPolysiloxane
(PolymericSilicone)
UFluorocarbonFiber
VFluorocarbonGranules
Note:
Designations1to9describeresintype,20to27describecompound,40to47describeadditives,and60to71describeprocessgrade.
Reinforcementand/orFiller.ShallbedescribedbyamendingthesuffixB-symbolusingletterdesigna-tionsinTable3.
Table3:
Thereinforcement,expressedasmass%,shallbespecifiedbythesecondandthirdnumeral(s)follow-ingtheamendedsuffixB-symbolwithatoleranceasindicatedbythefirstnumeralfollowingtheamendedsuffixB-symbol(seeTable4).
©CopyrightJune2001GeneralMotorsCorporationAllRightsReserved
Page2of11June2001
GMENGINEERINGSTANDARDSGM7001M
Table4:
NumeralDesignationTolerance
BA1-BV1MinValue
BA2-BV2MaxValue
BA3-BV3±0.1
BA4-BV4±0.5
BA5-BV5±1.0
BA6-BV6±2.0
BA7-BV7±3.0
Examples:
BA730=(30±3)%(27to33)%glassfibers
BA725,BN45=(25±3)%(22to28)%glassfiberswith(5±0.5)%(4.5to5.5)%molybdenumdisulfide
Note:
Inthecaseofmostreinforcement,thevalueshallbedeterminedbyISO3451/1orISO3451/4forpolyamides.Otherwisethetestmethodshallbeagreeduponbetweenpurchaserandsupplier.
Cross-ReferenceofReplacedSpecifications.
Subparagraphswerenotapplicable.
Symbol.Topermitlinecall-outofthedescrip-tionsmentioned,thesystemincludesasymbolforthegeneraltypeofplasticresintobeusedandalet-ter-numbersymbolforeachqualitylevelofeachprop-ertyorcharacteristic.
Example:
Anautomotiveresinmightbespecifiedasfollows:
GM7001MABS(DC1060,K460,M230,R106,S4110).
Note:
Whilethiscelltypeformatprovidesthemeansforclosecharacterizationandspecificationofeachpropertyandcombinationofpropertiesforabroadrangeofmaterials,itissubjecttopossiblemisappli-cations,sinceimpossiblepropertycombinationscanbecodediftheuserisnotfamiliarwithavailablecom-mercialmaterials.
TypicalApplication.Notapplicable.
Remarks.Notapplicable.
2References
Note:
Onlythelatestapprovedstandardsareappli-cableunlessotherwisespecified.
2.1Normative.
ASTMD256ASTMD638
ASTMD648ASTMD695
ASTMD747ASTMD785
ASTMD789ASTMD790
ASTMD792ASTMD1203
ASTMD1238ASTMD1505
ASTMD1525ASTMD2240
ASTMD2445ASTMG24
ISO62ISO75-1/2
ISO178ISO179
ISO180ISO294/1
ISO306ISO527
ISO604ISO868
ISO960ISO1133
ISO1183ISO3146
ISO3167ISO3451
ISO11014-1ISO11469
2.2GM.
GM6090MGM9032P
GM9059PGM9068P
GM9094PGM9538P
GMW3013GMW3059
2.3Additional.None.
3Requirements
3.1RequirementsonDelivery.Materialsapprovedtothisspecificationshallmeetthestandardrequire-mentsofGMW3013.
Thegeneraltypeofmaterialusedshallbeidenti-fiedbyasymbolfollowingtheGM7001Mspecifica-tionnumber.ThesymbolusedshallbeasdefinedinISO11469.Compoundsfurnishedtoaspecifi-cationbasedonthisstandardshallbecarefullypro-cessedvirginresinsofuniformcompositionandphys-icalproperties,suitableforuseinplasticpartsforau-tomotiveandrelatedapplications.Particlesizeshallbeasspecifiedonthepurchaseorder.
Resinsdescribedbythebasicnumberappendedbysuffixletter-numbersymbols,ie:
GM7001MABS(DC1060,K460,M230,R106,S4110)shallconformtoadditionalrequirementsoutlinedinSection6.
3.1.1ChemicalRequirements.
3.1.1.1Viscosity.WhenthesuffixEsymbolisnotamendedbyaletterthenthefollowingmethodshallapply:
3.1.1.1.1RelativeViscosity.AsdeterminedbythetestmethodforrelativeviscositydescribedinASTMD789shallbenolessthanthenumeral(s)oftheE-symboltimesthefactor10andnogreaterthananadditional25%ofthesuffixE-symbolnumeral(s)timesthefactor10.
Example:
E8=80to100
WhenthesuffixE-symbolisamendedbyaletterthefollowingmethodshallapply:
3.1.1.1.2MeltVolumeFlowRate.AsdeterminedbythetestmethodforvolumeflowratelistedinISO1133,shallbewithin±30%ofthevalueindi-catedbythenumeraloftheE-suffixsymboltimesthefactor0.01g/10minutes.ThestandardtestconditionsforthetestshallbegivenbytheletterfollowingthesuffixE-symbolasdescribedinthetableofISO1133.
Example:
Em80=(0.8±30)%g/10minutes(condi-tionM)
3.1.1.1.3FlowRate.AsdeterminedbythetestmethodforflowratelistedinASTM1238orISO1133,shallbewithin±30%ofthevalueindicatedbythefinalnumeralsoftheE-suffixsymboltimesthefactor0.01g/10minutes.ThestandardtestconditionsforthetestshallbegivenbythenumbersfollowingthesuffixE-symbolasdescribedinthetableofASTMD1238.
Example:
E190/2.16/80=190C/2.16kgload/(0.8±30)%g/10minutes.
3.1.2MechanicalRequirements.
3.1.2.1SpecificGravity.AsdeterminedbyASTMD792(MethodA)orISO1183(MethodA),shallbewithinthetoleranceindicatedbytheletterfollowingtheD-suffix(seeTable5),andthevalueshallbeasindicatedbythenumeralsfollowingtheD-suffixtimesthefactor0.001.ASTMD1505maybeusedinplaceofASTMD792providingdensityisconvertedtospecificgravitybythefollowing:
spgr23/23Cx0.9975=D23C,g/cm3.
Table5:
--Tolerance
Designation
DAMinValue
DBMaxValue
DC±0.02
DD±0.03
DE±0.05
DF±0.001
DG±0.002
DH±0.003
DesignationTolerance
DJ±0.004
DK±0.005
Example:
DH895=(0.895±0.003)
3.1.2.2MeltingPoint.AsdeterminedbythetestmethodformeltingpointlistedinASTMD789orISO3146MethodsAorB,shallbewithinatoleranceof±3CofthevalueindicatedbythenumeralofthesuffixF-symbolexpressedindegreesC.
Example:
F85=(85±3)C
Note:
AlternatemethodsofdeterminingmeltingpointsuitableforuseareGM9094PorISO3146,MethodCwhichcoverthethermalanalysistechniquecommonlyreferredtoasdifferentialscanningcalorimetry.
WhentheF-suffixsymbolisamendedbyaletterfol-lowingtheF-symbolthenthefollowin
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