Dugway/Tooele UT, USA
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Naptha, petroleum naptha, ligroin, and pet ether are all the terms for a very crude/inconsistent mixture of both aliphatic and a few non-aliphatic hydrocarbons produced from the crude oil refinement process. The composition is dependent on many things including the refinement process and the origin of the crude oil. Often a lot of other junk of varying composition is also found within, but in smaller amounts. Usually the mixtures are defined by the boiling point range from which they were fractionated during the purification process. 30 - 60 C is a very common range. In my research lab we typically shy away from using naptha (pet ether) due to the variabilty of composition even if prescribed within a published synthetic experimental. Instead another non-polar hydrocarbons with the desired boiling point such as heptane, hexane, pentane( which can be purchased in a pure or more pure form) are employed. This cuts out variable(s) from the experiment. Used as a solvent, the only real difference is purity and cost. Naptha is about as inexpensive as you can get when it comes to organic solvents.