What is the chemical formula of WD-40?


Quick Answer

WD-40 does not consist of a single chemical compound but rather a mixture of compounds. The manufacturer of WD-40 does not disclose the identity and amount of the ingredients but does acknowledge the product contains 50 percent mineral spirits.

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Full Answer

A gas chromatography/mass spectrometry analysis performed by WIRED found several distinct chemical compounds in WD-40, namely of a mixture of saturated and unsaturated hydrocarbons. The saturated hydrocarbons include nonane (C9H20), decane (C10H22) and several longer-chain congeners. Cyclohexane (C6H12) is also present. The main unsaturated hydrocarbon in the mixture is dimethylnapthalene (C12H12) as a mixture of regioisomers. Carbon dioxide was found to be the dissolved gas used as a propellant.

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