Heavy metal ions (mainly Ca²⁺, Mg²⁺) are commonly found in daily washing water. In the washing process, they will form insoluble metal salts with the active substances in soap or detergent, which will reduce the washing ability. Therefore, it is necessary to add heavy metal ions in detergent to make the water harmless.

Sodium tripolyphosphate technical grade produced by Chongqing Chuandong Chemical has strong chelating effect on heavy metal ions, which can be sealed up to eliminate its adverse impact on washing. In addition, it can capture all kinds of metal components in the dirt, and play the role of decomposing the dirt in the washing process.

Sodium tripolyphosphate produced by Chongqing Chuandong Chemical can swell and solubilize the protein in the dirt, and has the effect of defoaming, emulsifying the fat and dispersing the solid dirt.

Sodium tripolyphosphate(STPP) produced by Chongqing Chuandong Chemical can keep detergent dry and granular, and prevent agglomeration due to water absorption. In addition, sodium tripolyphosphate also has alkaline buffering effect, which is conducive to the removal of acid fouling.