Potassium sorbate, also known as 2, 4-hexadienate, is a potassium salt of sorbate with the formula C6H7O2K, colorless or white scaly crystal or crystalline powder. [1] Odorless or slightly smelly, long-term exposure to the air is easy to absorb moisture, be decomposed by oxidation and discoloration. Slightly soluble in water (58.2g /100 mL at 20 °C), soluble in propylene glycol (5.8g/l00mL) and ethanol (0.3g /10 mL). Potassium sorbate and sorbate are common organic preservatives, widely used in food, cosmetics, feed preservatives. Easy to be absorbed and metabolized by the human body, no residue in the body, no toxicity.