Re: Castaway Ray And Teflon Tape
Different thread, more to say. Should keep the threads together would make more sense. Here goes again, respectfully dis-agreeing, as I do have much respect for all posting here. <br /><br />I design pressure sealing (tapered)threads, and we pump some of the worst chemicals through our GRE pipe including gasoline and many much much worse chemicals at temperatures up to 220 F. TEFLON, PTFE is a prime ingredient in all the thread dopes we use, we even use teflon tape on some factory joints. (100% PTFE) is not chemically attacked or altered by gasoline, and I actually doubt that most PTFE tape is mixed with other plastics.<br /><br />PTFE is one of the slickest if not the slickest SOLIDS known to man, but it is not the slickest substance, many oils (liquids), including petroleum oils have a lower coefficient of friction than PTFE. <br /><br />Hooty, I've heard before how teflon was only a lubricant and not for sealing... This is incorrect, for instantace an API 8rd thread (pressure sealing tapered thread) when fully made up to the optimum position leaves a 0.003" gap between the root and crest of the threads, the flanks of the thread form a mechanical seal... without the sealant applied (teflon for one) to seal this gap area... the joint will leak at a given pressure.<br /><br />Now on to the meat of the original post, there's little pressure in the plastic tank and the brass thread will likely deform the plastic and seal without the teflon, or you could put it in. 1/2 dozen to one 6 to another.