Item

Standard No

Exact No

Sodium Tripolypyosphate(Na5P3O10),% ≥

90.0

92.1

Phosphate(base on P2O5) ,%         ≥

56.5

57.3

Insoluble substance in water, %      ≤

0.10

0.07

PH value

9.2-10.0

9.4

Whiteness,                       ≥

85.0

90

Fe,%                           ≤

0.015

0.009

Item No

Inspection Item

Standard No

Exact No

Single judge

1

STPP(Na5P3O10),% ≥

95.0

95.0

Qualified

2

Phosphate(base on P2O5) ,% ≥

57.0

57.1

Qualified

3

Insoluble substance in water, %≤

0.05

0.03

Qualified

4

 PH value  

9.5-10.0

9.6

Qualified

5

Arenic(base on As),%≤

0.0003

0.0002

Qualified

6

Heavy metal(base on Pb),% ≤     

0.001

0.0007

Qualified

7

Fluoride(base on F),%≤

0.003

0.002

Qualified

8

Chloride(base on Cl),%≤

0.025

0.012

Qualified

9

Sulphate(base on SO4),% ≤

0.4

0.32

Qualified

10

Whiteness,≥

85.0

87.5

Qualified