Sodium Tripolyphosphate 94% (STPP)

CAS No.:  7758-29-4

Molecular Formula: Na₅P₃O₁₀        Molecular weight：367.86

Structural Formula:

Properties：

White microdot powder with luster, melting point at 622 o C, easily soluble in water, with remarkable chelating ability to some metal ions such as Ca 2+, Mg 2+, can soften hard water, change suspension into solution, slightly alkaline, without causticity.

Usage：

Used as main auxiliary of synthetic wash, soap synergistic agent, water softener, leather pre-tanning agent, dye auxiliary agent, and dispersant of suspension such as paint, kaolin, magnesium oxide, calcium carbonate drilling mud, preservative agent for paper making, organic synthesis catalyzer, and used in epuration of petroleum product, gum latex storage, as dispersant, solvent in metal industry and pharmaceutical industry, also widely used in gum synthesis, foodstuff industry, and poultry process.

Specifications:

Specification	Industrial grade	Food grade
Main content, %≥	94.0	94.0
P2O5%≥	57.0	57.0
Water insoluble %≤	0.1	0.05
Iron, as Fe %≤	0.015	0.01
pH of 1% water solution	9.2-10.0	9.5-10.0
Heavy metal, as Pb %≤	-	0.001
Arsenic, as As , %≤	-	0.0003
Fluoride, as F, %≤	-	0.003
Chloride, as Cl %≤	-	0.025