NO.

Item

Unit

Index

First Quality

Second Quality

1

Whiteness%

%≥

96.5

95.0

2

fineness

-320-mesh

%≥

98

97

-100-mesh

%≥

100

100

3

Water

%≤

0.3

0.3

4

pH-value

7.5-8.5

7.5-90

5

Water absorption

ml/20g

6±1

6±1

6

Loss on ignition

%

34±1

34±1

7

Fe2O3

%≤

0.02

0.03

8

Sulphides

%

slight

slight

Main features

white crystal powder, high whiteness, moderate hardness, strong decontamination power, stable chemical property.

Range of application

high grade toothpaste friction modifier; as filter of other products