Potassium Carbonate is used as raw materials in manufacturing electro tube, TV kinescope, computer display. Physicochemical Properties: KNO3 is the rhombic system crystal powder or grain. Specific Density: 2.1109, Melting Point :333°C. While heated up to as high as 400°C, it will decompose and release oxygen and turn into Nitrite Potassium, then with the heating going on, it will eventually ...