The confusion comes from where the temp is measured. True the cart shouldn't see enough heat to melt anything. The liquid is wicked down to the heating coil where it is vaporized at a much higher temp than the cart sees.from wiki on nicotine
"As shown by the physical data, free base nicotine will burn at a temperature below its boiling point, and its vapors will combust at 308 K (35 °C; 95 °F) in air despite a low vapor pressure. Because of this, most of the nicotine is burned when a cigarette is smoked; however, enough is inhaled to provide the desired effects. The amount of nicotine inhaled with tobacco smoke is a fraction of the amount contained in the tobacco leaves."
a member's test on temperature of atomizer with and without mods
http://www.e-cigarette-forum.com/fo...test-electrial-properties-different-mods.html
i think the average temp found in the atomizer is about 130 f
if this is correct it seems well below the melting point of pet at 500f
I wasn't meaning to insinuate that there is danger of melting the nylon or even the poly fill during normal use.