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Mat er i alSel ec t i on

Thepl as t i c st hathavebeenc ons i der edandc anbeus edwi t hr ot at i onalmoul di ngar e pol ypr opyl ene,pol yet hyl ene,and pol ypr opyl ene.Ther equi r ement sf r om t hemat er i alar es t r engt ht ohol dt hewat erandt hef or c est hati ti sgoi ngt obes ubj ec t edt oi nus e.Mat er i alal s omus tc r uc i al l ybeabl et omanuf ac t ur edwi t ht hemet hodofr ot at i onalmoul di ng. Pr oper t i esofpl as t i c s :

Pol ypr opyl ene Wei ght :Pol ypr opyl enei sal i ght wei ghtmat er i al . Tens i l es t r engt h:I t st ens i l es t r engt hi squi t ehi gh.I ts howss t r ongr es i s t anc et owar dss t r es sandc r ac ki ng. Shape:Pol ypr opyl enei sc r ys t al l i nei nnat ur eandpos s es s esar egul argeomet r i c als hape. I ns ul at i on:I tac t sasanexc el l enti ns ul at or .Thatmeans ,i tpr event sf l ow ofel ec t r i c i t yt hr oughi t . Moi s t ur eAbs or pt i on:Pol ypr opyl enedoesnotgetdamagedbywat erexpos ur ebec aus ei t smoi s t ur eabs or pt i oni sver yl ow. Mel t i ngPoi nt :Mel t i ngpoi ntofpol ypr opyl enei s160째 C.Ther ef or e,unl i keot herpol ymer sl i kepol yet hyl ene,i ti sc apabl eof bei ngoper at i onalataver yhi ght emper at ur e. Cor r os i on:Thi spol ymerr emai nsunaf f ec t edwheni tc omesi nc ont ac twi t hc hemi c al ss uc hasal kal i nes ubs t anc es ,ac i ds ,degr eas i ngagent s ,el ec t r ol yt i cat t ac ks ,et c .However ,i t sr es i s t anc et owar dsar omat i coral i phat i chydr oc ar bons ,c hl or i nat ed s ol vent sandul t r avi ol etr adi at i oni snotver ys t r ong. Ot herUs ef ulPr oper t i es : I ti sanont oxi cs ubs t anc e. I tdoesnotgets t ai nedver yeas i l y. I tc anbeeas i l yf abr i c at ed. I tc anr et ai ni t ss t i f f nes sandf l exi bi l i t yi nt ac tevenatver yhi ght emper at ur es . Thes ec ondar ymat er i ali nt hi sdes i gnt hathasbeenc ons i der edar es t ai nl es ss t eel,oakandbi r c h,t heappl i c at i onoft hes ec ondar ymat er i ali sabas ef ort hepr i mar yc omponentr ai s i ngi tof ft hegr ound.Ther equi r ement sneededf r om t hi smat er i al ar er es i s t anc et ot heel ement ss uc hasr ai nands t r engt ht owi t hs t andt hef or c esexer t edupont hem. Pr oper t i es : Oak:Oaki st hemos twi del yus edhar dwood.Ther ear emor et han60s pec i esofoakgr owni nt heU. S. ,whi c hc anbes epar at edi nt ot wobas i cvar i et i es ;whi t eandr ed.Ther edvar i et yi sal s oknownasbl ac koak( ar ef er enc et oi t sbar k) . Pr oper t i es :Oaki saheavy,s t r ong,l i ghtc ol our edhar dwood.I ti sr i ngpor ous ,duet ot hef ac tt hatmor eandl ar gerc onduc t i veves s el sar el ai ddownear l yi nt hes ummer ,r at hert hanl at er .Pr omi nentr i ngsandl ar gepor esgi veoakac our s et ext ur e andpr omi nentgr ai n.Oakal s ohasc ons pi c uousmedul l ar yr ayswhi c hc anbes eenas" f l akes "i nquar t ers awedoakl umber . Bi r c h:Ther ear emanys pec i esofbi r c h.Theyel l ow bi r c hi st hemos tc ommer c i al l yi mpor t ant .Eur opeanbi r c hi sf i negr ai ned, r ar eandexpens i ve. Pr oper t i es :Bi r c hi sahar d,heavy,c l os egr ai nedhar dwoodwi t hal i ghtbr ownorr eddi s hc ol our edhear t woodandc r eam or l i ghts apwood.Bi r c hi sof t enr ot ar yorf l ats l i c ed,yi el di ngs t r ai ght ,c ur l yorwavygr ai npat t er ns .I tc anbes t ai nedt or es embl emahoganyorwal nut . St ai nl es ss t eel:St ai nl es ss t eelc anbeexpl ai nedasamet alal l oyt hatc ont ai nsabout30% ofc hr omi um ( Cr )andappr oxi mat el y50% ofi r on( Fe) .I ti snamedas' s t ai nl es s 'duet oi t shi ghl ys t ai nr es i s t antpr oper t i es .Thef or mat i onofani nvi s i bl e c hr omi umr i c hoxi des ur f ac ef i l m gi vess t ai nl es sc har ac t er i s t i c st os t eel .Har dnes ss howsr es i s t anc et openet r at i on.Heatr es i s t anc eofs t ai nl es ss t eelvar i esdependi ngupont het ypeofs t eel .Gr ade316H i st hemos tr es i s t antt ohi ght emper at ur es . I thast hepr oper t i esofbei ngat ouc hmet alr es i s t anc et oi mpac tandr es i s t antt or us tduet oi tbei nganal l oy. Wi t hr es ear c hi ngt hes emat er i al st heonest hatwi l lbeus edi nt hef i naldes i gnar epol yet hyl enef ort hemai nc omponent duet ot hes t r engt hoft hemat er i alandt her es i s t anc et ot hewat er ,andi tc anal s obemanuf ac t ur edus i ngt hepr oc es sofr ot at i onalmoul di ng.Andf ort hes ec ondar ymat er i alf ort hebas eIhavec hos ens t ai nl es ss t eel .Thi smat er i alhasbeenc hos en f ort hes et woc omponent st of ort heasi thast hepr oper t yr equi r ement st omeett hedes i gnsneedsofs t r engt handel ement r es i s t anc e.

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