Similar to waxes, stearic acid also works as lubricant. But it works as an internal lubricant. As it works as internal lubricant, It reduces the friction between PVC molecules, and decreases the melt viscosity and increases the flow.

Apart from lubrication, Stearic Acid gives good heat and light stability.

Apart from PVC industry, widely used in cosmetics, plastic cold-resistant plasticizers, mould release agents, stabilizers, surfactants, rubber vulcanization accelerators, waterproofing agents, polishing agents, metal soaps, metal mineral flotation agents, softeners, pharmaceuticals and other organic chemicals.