Sodium hypophosphite is a chemical containing water of crystallization. It is hydrophilic and relatively soluble in water. Its solubility at room temperature, around 20°C, is approximately 100g/L. Its solubility decreases at lower temperatures and increases at higher temperatures. If sodium hypophosphite is not properly protected from moisture during use, it will absorb moisture from the air over time, becoming viscous. This absorption is accelerated in environments with high humidity. In dry northern regions, the absorption is slower.

The absorption of moisture by inorganic salts and inorganic phosphates is a common physical phenomenon. The degree of moisture absorption and solubility are largely related to the hydrophilicity and hydrophobicity of the chemical itself. These hydrophilicity and hydrophobicity are determined by its molecular structure and elemental composition.

Therefore, please use up the sodium hypophosphite as soon as possible after opening the inner and outer packaging. If you cannot use up all the sodium hypophosphite after opening, tie the inner PP plastic bag tightly with a rope. Never leave the bag open in the warehouse for a long time, as this will cause it to absorb water vapor from the air and absorb moisture. If possible, store it in a dry, ventilated, and cool warehouse. Close the bag and store it immediately after use. Generally speaking, its shelf life is about one year.