Can be used as a lubricating and unblocking agent for drilling mud. The sodium or potassium salt of oleic acid is one of the components of soap. Pure sodium oleate has good cleaning ability, can be used as a surfactant such as emulsifier, and can be used to treat gallstones. Other metal salts of oleic acid can also be used in waterproof fabrics, lubricants, polishing agents, etc. Its barium salt can be used as a rodenticide.