DESCRIPTION:
The STPP powder is mainly used in the preparation of detergent or ceramic slurry. Molecular structure of STPP is presented in two different forms called phase 1 and phase 2. The rate of composition of the STPP in phase 1 and phase 2 gives various rate of hydration. In general, for each technique of slurry preparation, there is a specific quality of STPP.
For modern installations of detergent, with fast and powerful mixers, the stpp high rate of hydration is recommended. It permits reduction time in the preparation of the slurry, saving energy in the heating and the drying of the slurry and a better quality of detergent powder.
For other installations, the STPP with low or middle rate of hydration is recommended; this prevents the formation of lumps during the slurry preparation, but requires a slower preparation time and an extra energy consumption.
We have more than 38 Different STPP Specifications for detergent and ceramic uses, classified by 03 main categories of STPP Dense Powder, Granular, and light as follows :
STPP Dense Powder:
- Rapid Hydration
- Average Hydration
- Slow Hydration
STPP Granular:
- Granular Grade 1
- Granular Grade 2
- Granulated Hydrated Grade 1
- Granulated Hydrated Grade 2
STPP Low Density
STPP Dense Powder
Standard specifications for crushed STPP (rapid rate of hydration)
| Designations | Units | Specifications |
|
Phase I |
% | 40 - 60 |
|
Rate of hydration (ROH) : |
°C |
88 - 92 91 - 95 |
|
(P2O5) Content |
% | 56,5 ± 1 |
|
STPP content |
% | 94 mini |
|
Water content |
% | 0 - 1 |
|
Water insoluble materials |
% | 0.1 maxi |
|
Particle size : |
% |
0 5 maxi 75 mini |
|
pH (1% solution) |
--- | 9 - 10 |
|
Whiteness |
--- | L = 95 mini (Hunter L.a.b) |
|
Paulte density |
Kg/l | 0.7 – 1.0 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |
Sandard specifications for crushed STPP (average rate of hydration)
| Designations | Units | Specifications |
|
Phase I |
% | 20 – 45 |
|
Rate of hydration (ROH) : |
°C |
85 - 90 88 - 95 |
|
(P2O5) Content |
% | 56 ± 0.5 |
|
STPP content |
% | 94 mini |
|
Water content |
% | 0 - 1 |
|
Water insoluble materials |
% | 0.1 maxi |
|
Particle size : |
% |
0 5 maxi 75 mini |
|
pH (1% solution) |
--- | 9 - 10 |
|
Whiteness |
--- | L = 95 mini (Hunter L.a.b) |
|
Paulte density |
Kg/l | 0.7 – 1.0 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |
Standard specifications for crushed STPP (slow rate of hydration)
| Designations | Units | Specifications |
|
Phase I |
% | 10 - 20 |
|
Rate of hydration (ROH) : |
°C |
81 - 85 86 - 90 |
|
(P2O5) content |
% | 56 ± 0.5 |
|
STPP content |
% | 94 mini |
|
Water content |
% | 0 - 1 |
|
Water insoluble materials |
% | 0.1 maxi |
|
Particle size : |
% |
0 5 maxi 75 mini |
|
pH (1% solution) |
--- | 9 - 10 |
|
Whiteness |
--- | L = 95 mini (Hunter L.a.b) |
|
Paulte density |
Kg/l | 0.7 – 1.0 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |
STPP Granular
Standard specifications of Granular Grade I STPP
| Designations | Units | Specifications |
|
Particle size : |
% |
15 maxi 90 maxi |
|
Water content |
% | 1 maxi |
|
(P2O5) content |
% | 55.5 ±1 |
|
STPP content |
% | 94 mini |
|
Water insoluble materials |
% | 0.1 maxi |
|
pH (1% solution) |
--- | 9.4 - 10 |
|
Paulte density |
Kg/l | 0.9 – 1.2 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |
Standard specifications for Granular Grade II STPP
| Designations | Units | Specifications |
|
Particle size : |
% |
10 maxi 10 maxi |
|
Water content |
% | 1 maxi |
|
(P2O5) content (on dry) |
% | 55.5 ±1 |
|
STPP content (expressed as % of total phosphate content) |
% | 94 mini |
|
Water insoluble materials |
% | 0.1 maxi |
|
pH (1% solution) |
--- | 9 - 10 |
|
Paulte density |
Kg/l | 0.9 – 1.2 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |
Standard specifications for Granulated Hydrated Grade 1 STPP
| Designations | Units | Specifications |
|
Particle size : |
% |
15 maxi 90 mini |
|
Water content |
% | 5 - 9 |
|
(P2O5) content (on dry) |
% | 55.5 ±1 |
|
STPP content (on dry) |
% | 94 mini |
|
Water insoluble materials |
% | 0.1 maxi |
|
pH (1% solution) |
--- | 9 - 10 |
|
Paulte density |
Kg/l | 0.9 – 1.2 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |
Standard specifications for Granulated Hydrated Grade 2 STPP
| Designations | Units | Specifications |
|
Particle size : |
% |
10 maxi 10 maxi |
|
Water content |
% | 5 - 9 |
|
(P2O5) content (on dry) |
% | 55.5 ±1 |
|
STPP content (on dry) |
% | 94 mini |
|
Water insoluble materials |
% | 0.1 maxi |
|
pH (1% solution) |
--- | 9 - 10 |
|
Paulte density |
Kg/l | 0.9 – 1.2 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |
STPP Light
The lightweight STPP is typically used in the dry mixing-process.
By its high capacity to absorb liquids and active substances, it allows a better granulated detergent with a relatively low apparent density.
It could be also added in post-addition in the atomisation process to improve the density of the finished product or even to increase the capacity of the installation.
Standard specifications of light STPP:
| Designations | Units | Specifications |
|
(P2O5) content |
% | 56 ± 0.5 |
|
STPP content |
% | 94 mini |
|
Water content |
% | 1 maxi |
|
Water insoluble materials |
% | 0.1 maxi |
|
Particle size : |
% |
10 maxi 15 maxi |
|
pH (1% solution) |
--- | 9 - 10 |
|
Whiteness |
--- | L = 90 mini (Hunter L.a.b) |
|
Paulte density |
Kg/l | 0.3 – 0.44 |
|
Trace metals : |
ppm |
5 maxi 5 maxi 5 maxi 5 maxi 1 maxi 5 maxi 1 maxi 1 maxi 5 maxi 50 maxi 250 maxi |