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White Spirit is a petroleum distillate that is used as a paint thinner and mild solvent. In industry, mineral spirits are used for cleaning and degreasing machine tools and parts. According to Wesco, a supplier of solvents and cleaning equipment, mineral spirits "are especially effective in removing oils, greases, carbon, and other material from metal." Mineral spirits may also be used in conjunction with cutting oil as a thread cutting and reaming lubricant.Mineral spirits are an inexpensive petroleum-based replacement for the vegetable-based turpentine. It is commonly used as a paint thinner for oil-based paint and cleaning brushes, and as an organic solvent in other applications. Mineral turpentine is chemically very different from turpentine, which mainly consists of pinene, and it has inferior solvent properties. Artists use mineral spirits as an alternative to turpentine since it is less flammable and less toxic. Because of interactions with pigments, artists require a higher grade of mineral spirits than many industrial users, including the complete absence of residual sulfur.Mineral spirits have a characteristic unpleasant kerosene-like odor. Chemical manufacturers have developed a low odor version of mineral turpentine which contains less of the highly volatile shorter hydrocarbons. Odorless mineral spirits are mineral spirits that have been further refined to remove the more toxic aromatic compounds, and are recommended for applications such as oil painting, where humans have close contact with the solvent.In screen printing (also referred to as silk-screening), mineral spirits are often used to clean and unclog screens after printing with oil-based textile and plastisol inks. They are also used to thin inks used in making monoprints.Mineral spirits are often used inside liquid-filled compasses and gauges.Mineral spirits are also used for re-gripping golf clubs. After the old grip is removed, the mineral spirits are poured into the new grip and shaken. After, the mineral spirits are poured on the new underlying tape and the new grip is slid on. After an hour of drying out, the new grip and club are ready to use.Although not normally marketed as a fuel, white spirit can be used as an alternative to kerosene in portable stoves, since it is merely a light grade of kerosene. It cannot be used as an alternative to white gas, which is a much more volatile gasoline-like fuel.White spirits are also a major ingredient in some popular automotive fuel/oil additives, such as Marvel Mystery Oil, as they are capable of dissolving varnish and sludge buildup.Mineral spirits are also commonly used for cutting fluid in ultraprecision lathes (commonly referred to as diamond turning machines).
I'm not a chemist and haven't even compared the ingredient statements on any of these products so what I say has no scientific basis. I am familiar with marketing though, and would guess that there are relatively few manufacturers of mineral spirits. Many manufacturers make "private label" product. Basically the same stuff with different labels. Once a company has gone to the expense of researching and developing odorless mineral spirits they will use many avenues to sell it. One way is under their own name. Another is "private label". That's not to say that Weber and Gamblin don't have some kind of proprietary formula, but it seems unlikely that all the brands of odorless mineral spirits out there each have different formulas. In fact there is a little shelf sign at my local Daniel Smith store that says that their OMS has the same formulation as Gamsol. My guess is that OMS is OMS. The fact that your OMS is cheaper doesn't mean it's inferior, or even different.
The following are Threshold Limit Values (TLV) for an 8 hour work day (according to ACGIH: American Conference of Governmental Industrial Hygienists). Higher values are less toxic.Turpentine 100ppm (including W&N distilled)Aliphatic Hydrocarbons 100ppm (Turpenoid, Utrecht Odorless)Iso-paraffinic Hydrocarbons 171ppm (Maimeri Odorless)Common hardware store OMS 100-200ppmHydro-treated Heavy Naptha 300ppm (includes Gamsol)