棕剛玉是由鋁礬土經電弧爐冶煉而成，呈棕褐色，產品硬度高、韌性大，用其製成的磨具適用於磨削碳素鋼、一般合金鋼、可鍛鑄鐵、硬青銅等，並廣氾應用於剛玉鐵溝澆鑄料，搗打料等耐火製品。
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Chemical Composition
|
|
Grit Size
|
Al2O3
mass % - min.
|
Fe2O3 (Iron Oxide)
mass % - max
|
CaO (Calcium Oxide)
mass % -max
|
Titanium Oxide (TiO2)
mass %- max
|
|
F12-F20
|
95.0
|
0.2
|
0.3
|
1.7
|
|
F24-F90
|
95.0
|
0.2
|
0.3
|
|
F100-F120
|
95.0
|
0.2
|
0.4
|
|
F150-F180
|
95.0
|
0.3
|
0.4
|
|
F230-F280
|
95.0
|
0.4
|
0.5
|
|
F320-F600
|
94.0
|
0.4
|
0.5
|
|
F800-F1000
|
94.0
|
0.5
|
0.5
|
|
F1200
|
94.0
|
0.5
|
0.7
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