WD-40
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WD-40 with Smart Straw
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| Product type | Penetrating oil |
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| Owner | WD-40 Company |
| Country | San Diego, California, United States |
| Introduced | 1953 |
| Website | www |
WD-40 is the trademark name of a penetrating oil and water-displacing spray. The spray is manufactured by the San Diego, California–based WD-40 Company.
WD-40 was developed in 1953 by Norman Larsen, founder of the Rocket Chemical Company, in San Diego, California. "WD-40" is abbreviated from the term "Water Displacement, 40th formula", suggesting it was the result of Larsen's 40th attempt to create the product. The spray, composed of various hydrocarbons, was originally designed to be used by Convair to protect the outer skin and, more importantly, the paper-thin balloon tanks of the Atlas missile from rust and corrosion. These stainless steel fuel tanks were so fragile that when empty they had to be kept inflated with nitrogen to prevent them from collapsing. WD-40 was later found to have many household uses and was made available to consumers in San Diego in 1958.
The long-term active ingredient is a non-volatile viscous oil which remains on the surface to which it is applied, giving lubrication and protection from moisture. This oil is diluted with a volatile hydrocarbon to make a low viscosity fluid which can be aerosolized to penetrate crevices. The volatile hydrocarbon then evaporates, leaving behind the oil. A propellant (originally a low-molecular-weight hydrocarbon, now carbon dioxide) creates pressure in the can to force the liquid through the can's nozzle before evaporating.
Its properties make it useful in both domestic and commercial settings. Typical uses for WD-40 include removing dirt and extricating jammed screws and bolts. It can also be used to loosen stubborn zippers and displace moisture.
Due to its low viscosity, WD-40 is not always the preferred oil for certain tasks. Applications that require higher viscosity oils may use motor oils. Those requiring a mid-range oil could use honing oil.
WD-40's formula is a trade secret. To avoid disclosing its composition, the product was not patented in 1953, and the window of opportunity for patenting it has long since closed. WD-40's main ingredients as supplied in aerosol cans, according to U.S. Material Safety Data Sheet information, are:
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