Penetration It is important to distinguish between lubrication and penetration. WD-40's Primary Function WD-40 stands for Water Displacement, and this function is central to its identity.
WD-40 as a Penetrating Oil for Hinges, Pulleys, and Sliding Mechanisms
Simply spraying and immediately attempting to loosen the part rarely yields success. WD-40 excels as a lubricant for moving parts such as hinges, pulleys, and sliding mechanisms.
What Defines a Penetrating Oil? Penetrating oils are specialized formulations engineered to solve a specific mechanical problem: freeing seized or frozen metal parts. Agitating the mechanism by tapping the surrounding metal can help shock the rust and assist the fluid in making contact with the binding surfaces.
WD-40 as a Penetrating Oil for Hinges, Pulleys, and Sliding Mechanisms
While the product excels at lubricating and protecting surfaces, its classification as a true penetrating oil is specific and distinct from products designed solely to fracture rust. The solvents in WD-40 evaporate relatively quickly, leaving behind the lubricants, which means the mixture does not stay in the micro-gaps long enough to exert the sustained pressure required to break heavy rust bonds.
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