1FR Penetrating Fluid uses Nitrogen as a propellant, is Non-Conductive, Non-Flammable, and Dielectric Strength. 1FR Penetrating Fluid works with chemical action called Chelation to dissolve and remove hardened corrosion, rust and worn out died grease deposits which inhibit switch movement. Customer Testing proves full operation may be achieved in as little as 30-minutes when used to pre-treat switch parts. 1FR Penetrating Fluid is formulated for corroded parts and an excellent choice for freeing disconnect switches, rusty bolts or any other metal moving part.