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[/FONT] [FONT="]Acrylonitrile butadiene styrene (ABS)[/FONT]
[FONT="]ABS(Acrylonitrilebutadienestyrene)istough,resilient,andeasilymolded.Itisusuallyopaque,[/FONT]
[FONT="]althoughsomegradescannowbetransparent,anditcanbegivenvividcolors.ABSPVCalloys[/FONT]
[FONT="]aretougherthanstandardABSand,inselfextinguishinggrades,areusedforthecasingsof[/FONT]
[FONT="]powertools.
[/FONT] [FONT="]Composition[/FONT]
[FONT="](CH2CHC6H4)n[/FONT]
[FONT="]Caption[/FONT]
[FONT="]Thepicturesaysalot:ABSallowsdetailedmoldings,acceptscolorwell,andisnontoxicand[/FONT]
[FONT="]toughenoughtosurvivetheworstthatchildrencandotoit.[/FONT]
[FONT="]Design guidelines[/FONT]
[FONT="]ABShasthehighestimpactresistanceofallpolymers.Ittakescolorwell.Integralmetallicsare[/FONT]
[FONT="]possible(asinGEPlastics'Magix.)ABSisUVresistantforoutdoorapplicationifstabilizersare[/FONT]
[FONT="]added.Itishygroscopic(mayneedtobeovendriedbeforethermoforming)andcanbedamaged[/FONT]
[FONT="]bypetroleumbasedmachiningoils.ASA(acrylicstyreneacrylonitrile)hasveryhighgloss;its[/FONT]
[FONT="]naturalcolorisoffwhitebutothersareavailable.Ithasgoodchemicalandtemperature[/FONT]
[FONT="]resistanceandhighimpactresistanceatlowtemperatures.ULapprovedgradesareavailable.[/FONT]
[FONT="]SAN(styreneacrylonitrile)hasthegoodprocessingattributesofpolystyrenebutgreater[/FONT]
[FONT="]strength,stiffness,toughness,andchemicalandheatresistance.Byaddingglassfibertherigidity[/FONT]
[FONT="]canbeincreaseddramatically.Itistransparent(over90%inthevisiblerangebutlessforUV[/FONT]
[FONT="]light)andhasgoodcolor,dependingontheamountofacrylonitrilethatisaddedthiscanvary[/FONT]
[FONT="]fromwaterwhitetopaleyellow,butwithoutaprotectivecoating,sunlightcausesyellowingand[/FONT]
[FONT="]lossofstrength,slowedbyUVstabilizers.Allthreecanbeextruded,compressionmoldedor[/FONT]
[FONT="]formedtosheetthatisthenvacuumthermoformed.Theycanbejoinedbyultrasonicor[/FONT]
[FONT="]hotplatewelding,orbondedwithpolyester,epoxy,isocyanateornitrilephenolicadhesives.[/FONT]
[FONT="]Technical notes[/FONT]
[FONT="]ABSisaterpolymeronemadebycopolymerizing3monomers:acrylonitrile,butadieneand[/FONT]
[FONT="]styrene.Theacrylonitrilegivesthermalandchemicalresistance,rubberlikebutadienegives[/FONT]
[FONT="]ductilityandstrength,thestyrenegivesaglossysurface,easeofmachiningandalowercost.In[/FONT]
[FONT="]ASA,thebutadienecomponent(whichgivespoorUVresistance)isreplacedbyanacrylicester.[/FONT]
[FONT="]Withouttheadditionofbutyl,ABSbecomes,SANasimilarmaterialwithlowerimpactresistance[/FONT]
[FONT="]ortoughness.Itisthestiffestofthethermoplasticsandhasexcellentresistancetoacids,alkalis,[/FONT]
[FONT="]saltsandmanysolvents.[/FONT]
[FONT="]Typical uses[/FONT]
[FONT="]Safetyhelmets;campertops;automotiveinstrumentpanelsandotherinteriorcomponents;pipe[/FONT]
[FONT="]fittings;homesecuritydevicesandhousingsforsmallappliances;communicationsequipment;[/FONT]
[FONT="]businessmachines;plumbinghardware;automobilegrilles;wheelcovers;mirrorhousings;[/FONT]
[FONT="]refrigeratorliners;luggageshells;totetrays;mowershrouds;boathulls;largecomponentsfor[/FONT]
[FONT="]recreationalvehicles;weatherseals;glassbeading;refrigeratorbreakerstrips;conduit;pipefor[/FONT]
[FONT="]drainwastevent(DWV)systems.[/FONT]