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CHEMICAL ATTACK OF GEOTEXTILES <br /> (POLYPROPYLENE) <br /> Exarptod from 5chrAwder (1989): stsabflirad PP proaesaad quo <br /> '"Fundamental studies d PP(paalypraspylgne)g«xaorcYes have shown the properly <br /> gaaotextiies has an expa�ecl We of 2fl0 ysa<6, wan when subject to eRtapnta cartdltlons. Owing to Its Structural <br /> properties as a hydroc�bon construction, PP Is eutraifrttely stable cttenatc !► &xt*ad+l4 stroller tafatMitp me <br /> chemical stability of PP when axR�to hundreds d oro4nia and Inorgarrrato ch ad haw shcwrt It to let4 <br /> highly stable against: <br /> • adds; <br /> i alkalis: <br /> • aqueous solutions of inorganic sats; <br /> • detergents; <br /> • olls and greases; and <br /> i gawAns and lubricants. <br /> 'PP is vulnerable only to the folly wl"Cl substances' <br /> • highly wddlzad substances(peroAdo): <br /> • concer'Wated nitric add (fumic rdtric acid),concentrated sU43hauic add,c111crowl�ha to edea; <br /> ♦ pure halogen; <br /> • c artaln chlorinated hydrocarbons(halogerMod hydrocarbons): and <br /> • cortadn wo oda hydrocarbons, <br /> 'At normal trwripetrQttures, PP exhibits no chartgawhaori brought Into contact with water;however.water ertra <br /> wash out soma of the stabilizers against photo. and thermo-ctddadon,which oould adfea the kng term <br /> performance cf PP, <br /> ,S1nca PP can ozidize when exposasd to atmospheric oxygen It Is Importwd dug kr+g-torm stabilizers be amdd+Pd <br /> to ft." <br /> l~atagarpied from wfiglary (1989): <br /> '(Polyethylene and polypropylene)are essentiaiallY Inert and have nO krmwn sdvaents at sixrcbith a is nae^off ad . <br /> . all known tests in chemical aanviranments likely to be erxxKnerasd in sols 1co f rm than)there is no etfeet on <br /> HOPE or PP. F,von if a spial occs.arrod by accident of one d the low saovere aq!'tte ikAds Omtt OW affect these <br /> GQ <br /> poiymers. e.g. fumic Nitric Add, then the radion than wd.ild be needed to nee OW dilution with Safe <br /> erd ranont <br /> also of groundwater and drains-noArallsa 10n elf, at Iasal[ast,tit *4h <br /> render them harmless to HDPE and PP.' <br /> continued . . . <br /> CHEMICAL DEGRADATION <br /> CONSIDERATIONS PA(3F- ,,,„OF,,,_, <br /> I0 �t�d } ��Z�E6990L LS=�T 66&T/60150 <br />