▁in ▁engineering ▁applications . ▁It ▁was ▁originally ▁introduced ▁by ▁Vict re x ▁P LC , ▁then ▁I CI ▁( Im per ial ▁Chem ical ▁Indust ries ) ▁in ▁the ▁early ▁ 1 9 8 0 s . ▁It ▁has ▁attract ive ▁properties ▁like ▁good ▁ab ras ion ▁resistance , ▁low ▁fl amm ability ▁and ▁emission ▁of ▁smoke ▁and ▁to xic ▁g ases . ▁ ▁Poly ether im ide ▁Poly ether im ide ▁( PE I ), ▁produced ▁by ▁a ▁novel ▁nit ro ▁disp lacement ▁reaction ▁involving ▁bis phen ol ▁A , ▁ 4 , ▁ 4 ’ - m eth y len ed ian il ine ▁and ▁ 3 - nit roph th al ic ▁an h yd ride , ▁has ▁high ▁heat ▁dist ort ion ▁temperature , ▁tens ile ▁strength ▁and ▁mod ulus . ▁ ▁They ▁are ▁generally ▁used ▁in ▁high ▁performance ▁elect rical ▁and ▁electronic ▁parts , ▁mic row ave ▁app li ances , ▁and ▁under - the - hood ▁autom ot ive ▁parts . ▁ ▁Poly eth yl ene ▁Poly eth yl ene ▁( poly eth ene , ▁pol yth ene , ▁P E ) ▁is ▁a ▁family ▁of ▁similar ▁materials ▁categor ized ▁according ▁to ▁their ▁density ▁and ▁mole cular ▁structure . ▁It ▁is ▁also ▁known ▁as ▁poly ▁and ▁is ▁obtained ▁by ▁the ▁addition ▁polym er isation ▁of ▁eth yl ene . ▁It ▁may ▁be ▁of ▁low ▁density ▁or ▁high ▁density ▁depending ▁upon ▁the ▁process ▁used ▁in ▁its ▁manufact uring . ▁It ▁is ▁resist ant ▁to ▁mo ist ure ▁and