Consequently, using WD-40 on a hot engine is strongly discouraged and creates a significant fire risk, making it appear flammable in that specific scenario. Its low viscosity and quick-evaporating nature mean it leaves minimal residue, but this does not equate to being a fire hazard under normal use conditions.
WD-40 Storage Safety: Understanding Flammability Facts
However, modern WD-40 cans utilize a non-flammable gas propellant. The product is almost exclusively sold in an aerosol spray can, which relies on a pressurized propellant to expel the lubricant.
Lubrication Myths Another reason the flammability question persists is a common misunderstanding about what WD-40 is designed to do. This means that the primary force expelling the lubricant is not a fuel source, significantly reducing the immediate fire hazard associated with spraying the product.
Understanding WD-40 Flammability and Safe Storage Practices
While it displaces moisture and provides temporary lubrication, its primary function is not long-term lubrication. Historically, many aerosol products used highly flammable hydrocarbons like butane or propane as propellants.
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