White spirit is a petroleum-based solvent made from a blend of hydrocarbons distilled from crude oil. It is one of the most widely used solvents in the world, found in everything from household paint thinners to industrial degreasing operations. If you’ve ever cleaned oil-based paint off a brush, there’s a good chance white spirit was involved. In the United States and Canada, the same product is typically sold as “mineral spirits,” while in Australia and New Zealand it goes by “mineral turpentine.” You may also see it labeled as turpentine substitute, petroleum spirits, or simply paint thinner.
What White Spirit Is Made Of
White spirit is a complex mixture of hydrocarbons, mostly with 7 to 12 carbon atoms per molecule, derived from the naphtha and kerosene fractions of crude petroleum. It boils in a range of roughly 130°C to 220°C, which places it between gasoline (lighter) and diesel fuel (heavier) on the petroleum spectrum. It is insoluble in water and evaporates relatively slowly compared to lighter solvents like acetone, which makes it effective for tasks where you need the solvent to stay wet on a surface long enough to dissolve something.
The exact composition varies depending on how the product is refined. There are three main types. Type 1 is hydrodesulfurized (the most common, and the version sold as Stoddard solvent in the US). It can contain up to 25% aromatic hydrocarbons by weight. Type 2 is solvent-extracted, bringing aromatic content below 5%. Type 3 is hydrogenated, which strips aromatics down to less than 1%. This last type is what you’ll find sold as “odorless” white spirit. Aromatics are the compounds responsible for much of the strong smell and also carry greater health risks, so lower-aromatic versions are generally preferred for indoor or hobby use. All types contain less than 0.1% benzene, a known carcinogen, with the hydrogenated type containing virtually none.
How White Spirit Differs From Turpentine
White spirit and turpentine serve similar roles as paint solvents, but they come from entirely different sources. Turpentine is a natural product extracted from the resin of living pine trees. White spirit is a synthetic product refined from petroleum. This difference matters in practice: turpentine can dissolve natural resins like dammar, copal, and mastic, which makes it essential for certain traditional painting techniques and varnish work. White spirit cannot dissolve those natural resins, but it handles alkyd (synthetic) resins just fine. For most modern oil-based paints, white spirit works perfectly well and tends to be both cheaper and less flammable than turpentine.
Common Uses Around the Home and Workshop
The most familiar household use is cleaning brushes and tools after working with oil-based paint, varnish, or wood stain. White spirit dissolves the oily binder in these products, letting you rinse a brush clean instead of throwing it away. It also works well for removing adhesive residue from glass, metal, and other non-porous surfaces, and for wiping grease and grime off auto parts, hand tools, and mechanical components.
In industry, white spirit is used on a larger scale for degreasing machine parts, as a component of aerosol sprays and wood preservatives, and as a lubricant mixed with cutting oil during metalworking. It also appears as an ingredient in lacquers, varnishes, and asphalt products. Some people use it as a charcoal grill starter, though purpose-made lighter fluids are more common for that.
Health Risks of Exposure
White spirit is not acutely dangerous at the levels most people encounter during a weekend painting project, but it is far from harmless. The primary risk for casual users is inhaling the vapor in a poorly ventilated space. At concentrations around 600 mg per cubic meter of air (roughly 100 ppm), eye irritation begins. At higher concentrations, respiratory irritation and symptoms affecting the nervous system appear: headache, dizziness, fatigue, and a feeling of drunkenness. In controlled testing, seven hours of exposure at 600 mg per cubic meter impaired balance and slowed reaction time. A 50-minute exposure at a much higher concentration (4,000 mg per cubic meter) measurably reduced perceptual speed and short-term memory.
Extreme exposure is genuinely dangerous. At least one case of cardiac arrest has been documented after excessive inhalation during painting in a confined space.
Skin contact is the other common route. Brief, incidental contact is a mild irritant for most people. The real problems come from prolonged exposure, such as wearing clothes that have been soaked or splashed with white spirit for hours. This can cause significant skin irritation and dermatitis. White spirit strips the natural oils from your skin, so even short repeated contact over many days can leave hands dry, cracked, and vulnerable to infection.
Grades and Flash Points
White spirit is sold in three broad flash-point grades, which determines how easily it can ignite. Low-flash grades have a flash point between 21°C and 30°C (about 70–86°F), making them relatively flammable. Regular grades flash between 31°C and 54°C. High-flash grades won’t ignite below 55°C (131°F), making them the safest choice for indoor work or situations near heat sources. The product most commonly sold at hardware stores in standard containers is typically a regular grade with a flash point around 40°C (104°F).
Regardless of grade, white spirit vapor is heavier than air and can pool at floor level, creating an invisible fire or inhalation hazard in enclosed spaces like basements or garages. Good ventilation is not optional when using this solvent indoors.
Safe Handling and Disposal
When using white spirit, work in a well-ventilated area or outdoors. Wear chemical-resistant gloves if you’ll be handling it for more than a few seconds, and avoid skin contact with soaked rags or clothing. If you get it on your clothes, change promptly rather than letting the fabric sit against your skin.
Rags or paper towels soaked with white spirit are a genuine fire hazard. As the solvent evaporates, the process can generate enough heat to cause spontaneous combustion, particularly if the rags are bunched together. Lay used rags flat to dry in a well-ventilated outdoor area, or submerge them in a sealed metal container filled with water until you can dispose of them properly.
White spirit is classified as hazardous waste and should never be poured down a drain, into a storm sewer, or onto the ground. Most communities operate household hazardous waste collection programs, either through permanent drop-off facilities or scheduled collection events. Your local county or city waste management website will list the nearest option and accepted materials. Used white spirit that has been strained of paint solids can often be reused for rough cleaning tasks before it needs disposal, which reduces both waste and cost.