项  目

Item

工业级指标

Industrial Grade

优级

Excellent class

一级

First class

二级

Second class

三聚磷酸钠(Na5P3O10) , w/%              ≥

Main contents

96

90

85

五氧化二磷（以P2O5计) , w/%            ≥

P2O5

57.0

56.5

55.0

水不溶物，w/%                         ≤

Water insoluble

0.10

0.10

0.15

铁（以Fe计) , w/%                       ≤

Iron (as Fe）

0.007

0.015

0.030

百度，%                              ≥

Whiteness

90

85

80

pH值（1%溶液）

pH value (1%solution)

92 ~ 10.0

颗粒度

Particle size

通过1.00mm试验筛的筛分率不低于95%

Through 1.00mm mesh sieve≥95%

l型含量和表观密度达客戸要求。Phase l and bulk density:According to customer’s demand.