Do you know Phase I of Sodium Tripolyphosphate(STPP)

When we share you quotation of Sodium Tripolyphosphate(STPP),We always mentioned Phase I content.Do you know what is the Phase I?

Sodium Tripolyphosphate anhydrous existed by STPP-Ⅰ(High Temprature Type) and STPP-Ⅱ(Low Temprature Type).When Polymerization temperature is rise to 417 centigrade,STPP-Ⅱ is easliy to change to STPP-Ⅰ.But it is very difficult to change STPP-Ⅰ to STPP-Ⅱ .STPP is the compound of  STPP-Ⅰ and STPP-Ⅱ.

The main difference is as the followings,

STPP-Ⅰ us with faster hydration than STPP-Ⅱ .The hydration of Na5P3O10.6H2O will be separated from When soluble in water to form insoluble crystal cluster or clumps,which will influence the detergent produce. Henceforce,for detergent industry, STPP-Ⅱ  is more suitable.