5. Material Specifications. Chemical & Physical Data: Potassium Permanganate Formula....KMn04 Formula Weight....158.03 Form....Granular Crystalline Matter Specific Gravity 6% Sol. by Weight, 15 /4 C....1.0414 Bulk Density....1.6 gr/cc (100 lb/ft3) Melting Point....10.2 Kilocalories/mole required at 16 C in 700 moles of water. Crystals or granules are dark purple with a blue metallic sheen, sometimes modified by a dark bronze like appearance. Free flowing grade for use in a dry chemical feeder is gray due to an additive. Has sweetish, astringent taste and is odorless. It is soluble in water, acetone, and 41 methanol and is decomposed by alcohol. The Potassium Permanganate must meet the AWWA B603-77, or latest revision, standard. The product must remain stable for at least three (3) years.