Item

Industrial Grade

Excellent class

First class

Second class

STTP(Na5P3O10) , w/%              ≥

Main contents

96

90

85

Phosphorus pentoxide（以P2O5计) , w/%            ≥

P2O5

57.0

56.5

55.0

Water insoluble w/%                         ≤

0.10

0.10

0.15

Iron (as Fe） w/%                       ≤

0.007

0.015

0.030

Whiteness，%                              ≥

90

85

80

pH value (1%solution)

92 ~ 10.0

Particle size

Through 1.00mm mesh sieve≥95%

。Phase l and bulk density:According to customer’s demand.