Mineral Spirits 66

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Mineral Spirits 66 is a clear, colorless liquid with a kerosene-like odor. It is used to thin paints, in coatings, waxes, inks, degreasing, industrial cleaning and in herbicides.

Mineral Spirits 66 is also classified as a type 3 mineral spirits (hydrotreated heavy naphtha). Mineral spirits (U.S.) or white spirits (U.K.), also known as mineral turpentine, turpentine substitute, petroleum spirits, solvent naphtha (petroleum), varsol, or, generically, "paint thinner", is a petroleum-derived common organic solvent.

Artists use mineral spirits as an alternative to turpentine, because it is less flammable and less toxic. Because of interactions with pigments, painters require a higher grade of mineral spirits, including the absence of residual sulfur.


Use to thin oil-based and alkyd-based paints for better flow, penetration and leveling. Use to dilute wax and wax pastes. Use as a cleaner to remove wax and oil. This solvent is recommended to dilute Conservar Isolating / Finishing Varnish and Conservar Finishing Varnish. It is also the best solvent to dilute most alkyd paints and mediums.


Use Mineral Spirits 66 to dissolve paint, varnish or mediums, then wash off the residue in warm soapy water, and finally rinse in clean water.

Mineral Spirit Types

Three different types and three different grades of mineral spirit exist. The type refers to whether the solvent has been subjected to hydrodesulfurization (removal of sulfur) alone (type 1), solvent extraction (type 2) or hydrogenation (type 3). Each type comprises three different grades: low flash grade, regular grade, and high flash grade. The grade is determined by the crude oil used as the starting material and the conditions of distillation.

In addition there is type 0, which is defined as distillation fraction with no further treatment, consisting predominantly of saturated C9 to C12 hydrocarbons with a boiling range of 140–200 °C.

Mineral Spirit Types
CAS No. EINECS No. Name Notes
8030-30-6 232-443-2 Naphtha
8052-41-3 232-489-3 Stoddard solvent
64475-85-0 265-185-4 Mineral spirit type 1
64741-92-0 265-095-5 Mineral spirit type 2 Solvent-refined heavy naphtha (petroleum)
64742-48-9 265-150-3 Mineral spirit type 3 Hydrotreated heavy naphtha (petroleum)
64742-88-7 265-191-7 Mineral spirit type 0 Medium aliphatic solvent naphtha (petroleum)
Name Mineral spirits
Appearance Clear, colorless liquid
Chemical Name Hydrotreated heavy naphtha (petroleum)
CAS No. 64742-47-8 / 64742-48-9
Typical Properties
Initial boiling point (IBP) 148–185 °C
Final boiling point (IBP) 220 °C
Average relative molecular mass 140
Relative density (at 15 °C) 0.772
Flash point 39.4441.7 °C
Vapor pressure (at 20 °C) 1.4 kPa
Volatility (n-butyl acetate=1) 0.20
Autoignition temperature >220 °C
Explosion limits (% by volume in air) 0.6–6.5
Vapor density (water=1) 0.758–0.78 @ 15.625 °C
Refractive index (at 20 °C) 1.41–1.44
Viscosity (at 25 °C) 0.74–1.65 cps
Solubility (% by weight in water)
Kauri-butanol value 32
Aniline point 154 °F (60–75 °C)
Reactivity Reacts with strong oxidizing agents
Odor threshold (mg/m3)
Health and Safety

WARNING! Contains Petroleum Distillates. Flammable liquid and vapor. Harmful if swallowed, inhaled or absorbed through skin. Affects central nervous system. Causes irritation to skin, eyes and respiratory tract. Overexposure may result in nausea, headache, confusion or instability. Conforms to the health requirements of ASTM D4236.

PRECAUTIONS: Avoid prolonged contact with skin and breathing vapors. Keep away from eyes. Keep away from heat or flame. Use with adequate ventilation. KEEP OUT OF REACH OF CHILDREN.

FIRST AID: If swallowed do not induce vomiting, get prompt medical attention. If eye irritation occurs, rinse with water 5-10 minutes. If symptoms occur, move to fresh air. If symptoms persist, see a physician. For further health information contact a local poison control center or call 1-800-445-7067.

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