This is an antifungal that is widely used as a preservative found in food, drugs, and cosmetics.
Propyl Hydroxybenzoate is soluble 1 in 2500 of water and 1 in 1.5 of alcohol. The solubility of both componds is increased in hot water. A combination of agents provides a more effective antimicrobial preservative system and propylene glycol also increases the activity.