Potassium Hydrogen Phthalate also commonly known as KHP. We are keeping ready stock of high purity KHP. Potassium Hydrogen Phthalate is easy to dry; is neither hygroscopic, oxidized by air, nor affected by Carbon Dioxide. KHP does not undergo decomposition during storage; has a relatively high equivalent weight (thus reducing errors when weighed to 0.1 mg precision); is readily soluble in water; and is stoichiometric and instantaneous in reactions.