It has no dyes and fewer impurities than 2-K kerosene and is refined to reduce the sulfur content improve air quality and extend the wick life of kerosene burning appliances. Klean-Strip kerosene meets ASTM 1-K specifications and is suitable for all kerosene-burning heaters lamps and stoves 1-K Kerosene For Heaters/Lamps/Stoves 128 oz.