... (d420) 1.19, viscosity (23 °C) 5.0 mPa · s, freezing point-18 ~ 21.5 °C, PH 3.5 ~ 5.0 ... , it is soluble in water, low carbon glycol and glycol. Best ... a year, few activity decline, the heat storage activity decline, it can and anion and cation, the ion and all kinds ...