DM STPP 107 (E451(i)) is the sodium salt of the polyphosphate penta-anion. It is white powder. Its' melting point is 622°C.It is easily soluble in water.

Benefits
Better water solubility.
White free-flowing crystalline powder.
DM STPP 107 has salient chelating capacity to ions of Ca, Mg etc.
DM STPP 107 is a surfactant which has outstanding emulsification for lubricants and fat.
DM STPP 107 has different bulk density, i e. low density 0.35-0.5g/cm3, medium density 0.51-0.65g/cm3 and high density 0.66-0.9g/cm3.
DM STPP 107 has two kinds of crystalline forms, namely Phase I (of high temperature) and Phase II (of low temperature). The chemical characters of the two types are the same, and the difference between them lies in the thermo stability.
Product Parameters
 
Specifications
Characteristics
Unit
Standard Request
Test Method
Main content
% (w/w)
95Min
GB25566-2010
Water Insoluble matter
% (w/w)
0.05 Max
GB25566-2010
Arsenic (As)
ppm
3 Max
GB25566-2010
P2O5
% (w/w)
56 Min
GB25566-2010
Heavy Metal (as Pb)
ppm
10 Max
GB25566-2010
pH value (1% aqueous solution)
 
9.5-10.0
GB25566-2010
Granularity (on 1.00mm sieve)                          
%
5.0 Max
GB25566-2010
SO4
% (w/w)
0.4Max
GB25566-2010
Whiteness
% (w/w)
85Min
GB25566-2010
¹¹) Delivery specification: The product is monitored on a regular basis to ensure that it adheres to the specified values.
²) Technical data: The technical data are used solely to describe the product and are not subject to regular monitoring.