Molecular weight分子量

102

Mohs hardness

摩氏硬度

---

Density g/cm³

密度

---

Ratio of refraction

折光率

1.76

Item                    Model

HJA-4

HJA-4M

HJA-5

HJA-5M

Chemical constituent

化學成分

Al₂O₃    [%]          ≥

99.5

99.5

99.8

99.8

SiO₂     [%]        ≤

0.04

0.04

0.04

0.04

Fe₂O₃    [%]       ≤

0.03

0.03

0.03

0.03

Na₂O    [%]        ≤

0.40

0.40

0.08

0.08

Loss on ignition 灼減 ≤

0.2

0.2

0.2

0.2

+325 mesh  325目篩上≤

---

3

----

0.3

α- Al₂O₃ [%]         ≥

90

90

90

90

Mean particle diameter粒度（D50） μ m    

70-90

4-6

70-90

0.5-1.5

Notes: In this specification, the mean particle size can also be produced according to customer's requirements. 備注：可根據客戶要求調整產品粒度