In 1953, a fledgling company called Rocket Chemical Company and its staff of three set out to create a line of rust-prevention solvents and degreasers for use in the aerospace industry, in a small lab in San Diego, California.
It took them 40 attempts to get the water displacing formula worked out. But they must have been really good, because the original secret formula for WD-40—which stands for Water Displacement perfected on the 40th try—is still in use today.
Convair, an aerospace contractor, first used WD-40 to protect the outer skin of the Atlas Missile from rust and corrosion. The product actually worked so well that several employees snuck some WD-40 cans out of the plant to use at home.
A few years following WD-40's first industrial use, Rocket Chemical Company founder Norm Larsen experimented with putting WD-40 into aerosol cans, reasoning that consumers might find a use for the product at home as some of the employees had. The product made its first appearance on store shelves in San Diego in 1958.
La conscience scientifique des USA est et reste la NASA , pas seulement pour l'aéronautique d'ailleurs

)
( le missile Atlas :
http://en.wikipedia.org/wiki/Atlas_missile)
In french c'est ici
http://www.wd40.fr/index.cfm?articleid=440Main ingredients, from the material safety data sheet, are:
* 50%: Stoddard solvent (mineral spirits, somewhat similar to, but not the same as, kerosene)
* 25%: Liquefied petroleum gas (presumably as a propellant, carbon dioxide is used now to reduce considerable flammability)
* 15+%: Mineral oil (light lubricating oil)
* 10-%: Inert ingredients
The German version of the mandatory EU safety sheet lists the following safety relevant ingredients:
* 60-80%: Heavy Naphtha (petroleum product), hydrogen treated
* 1-5%: Carbon dioxide
C'est un sacré bon produit .... que jai découvert en attérissant sur ce forum

je ne connaissais pas ça avant lol

Franchement, je ne savais pas tout ça sur le WD40 , avant .... dix minutes, je n'ai fais la recherche que perceque tu parlais de l' USN ..... donc ça m'a intrigué

Mais ils doivent bien l'utiliser un peu partout où il est efficace, ça c'est certain
