Blue Flame is a clean butane fuel manufactured in the USA to extremely high standards of quality. No mercaptans, no toxic lubricants. Food-grade BPA-free lining. This is the same food-grade lining used for beverage containers keeping your N-Butane clean by ensuring zero oily manufacturing residues are in the can. Blue Flame refill cans are used as a fuel source for small hand held lighters and torches, camping stoves, lamps, small power equipment and generators, even as a refrigerant in refrigerators, freezers, and some air conditioning units. Always use in a well ventilated area.