▁material , ▁as ▁flu or oc ar b ons ▁demonstrate ▁mit ig ated ▁London ▁disp ersion ▁forces ▁due ▁to ▁the ▁high ▁electron eg ativity ▁of ▁flu or ine . ▁This ▁also ▁supports ▁its ▁use ▁in ▁coat ings ▁of ▁cook ing ▁w are . ▁The ▁polym er ▁has ▁one ▁of ▁the ▁lowest ▁coefficients ▁of ▁fr iction ▁of ▁any ▁solid ▁and ▁is ▁therefore ▁commonly ▁used ▁for ▁bear ings ▁and ▁support ▁of ▁moving ▁mechanical ▁parts . ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : Pl ast ics ▁▁ ▁Category : Ro of ing ▁materials <0x0A> </s> ▁The ▁lo ach ▁g oby , ▁R hy ac ich th ys ▁as pro , ▁is ▁a ▁g oby ▁belonging ▁to ▁the ▁family ▁R hy ac ich thy idae . ▁It ▁is ▁not ▁f ished ▁commer cially . ▁ ▁Tax onomy ▁The ▁lo ach ▁g oby ▁is ▁one ▁of ▁the ▁two ▁species ▁class ified ▁under ▁the ▁genus ▁R hy ac ich th ys ▁in ▁the ▁family ▁R hy ac ich thy idae . ▁ ▁Th acker ▁and ▁Hard man ' s ▁study ▁of ▁the ▁mole cular ▁ph y log eny ▁of ▁g ob ies ▁indicates ▁the ▁lo ach ▁g oby ▁is ▁the ▁most ▁primitive ▁member ▁of ▁the ▁G ob io ide i . ▁ ▁Description ▁The ▁lo ach ▁g oby ▁is ▁ ▁long . ▁It ▁has ▁eight ▁d ors al ▁sp ines , ▁eight ▁or ▁ 9 ▁soft ▁d ors al ▁ray s , ▁one ▁anal ▁sp ine , ▁and ▁eight ▁or ▁ 9 ▁anal ▁ray s . ▁The ▁head