Hypophosphorous Acid, HPA 50% Chinese factory   CAS No.: 6303-21-5  Molecular formula: H3PO2  Molecular Weight: 66.0 UN: 3264   Why choose RICH Group as your HPA supplier? One of main raw materials of Hypophosphorous Acid, HPA is sodium hypophosphite(SHPP), as RICH Group is also one of biggest supplier of SHPP, RICH Group has a...