BROWN ALUMINUM OXIDE

BAO is a tough, medium density, virgin, fused brown aluminum oxide abrasive.

BAO is designed for pressure blasting of materials of almost every type, including glass, granite, marble and ceramic. It is also used for the preparation of surfaces prior to painting or bonding; as well as for light deburring, scale removal and a generation of matte finishes. BAO is closely sized, enabling operators to consistently duplicate finishes.


This product is produced to conform to C.I.D. -A-A-59316, General Electric Aircraft Engine Group D50TF5, and most Pratt and Whitney Aircraft PMC Specifications.

 

Brown Aluminum Oxide 
AL2O396.12%
TiO22.70%
SiO2.67%
Fe2O3.11%
Other Oxides.40%

 

HARDNESS COMPARISONS

Blasting MediaMOHS Value*Knoop Value**
Diamond10.07000
Brown Aluminum Oxide9.02100
Garnet7.01360
Quartz7.0820
Sand6.0560

* The MOHS Hardness Scale measures the hardness of aluminum oxide in relation to other blasting media – on a scale of 1-10.
** The Knoop scale measures hardness on a scale of 0 – 7,000

 

GRIT SIZE CONVERSION

Grit SizeInches (average)Microns (average)
160.0431092
200.037940
240.027686
300.022559
360.019483
460.014356
540.012305
600.010254
700.008203
800.0065165
900.0057145
1000.0048122
1200.0040102
1500.003589
1800.003076
2200.002563

Note: * The conversions listed are for various grits sized according to the Bureau of Standards specifications, under Simplified Practice Recommendation 118-50

16



All pass No. 8 Screen
6% retained on No. 14 Screen
88% retained on No. 18 Screen
Max 5% thru a No. 25 Screen

80



All pass No. 45 Screen
21% retained on No. 70 Screen
74% retained on No. 100 Screen
Max 5% thru a No. 140 Screen

20



All pass No. 10 Screen
12% retained on No. 16 Screen
79% retained on No. 20 Screen
Max 5% thru a No. 30 Screen

90



All pass No. 50 Screen
10% retained on No. 80 Screen
84% retained on No. 120 Screen
Max 5% thru a No. 170 Screen

24



All pass No. 14 Screen
19% retained on No. 18 Screen
76% retained on No. 25 Screen
Max 5% thru a No. 40 Screen

100



All pass No. 60 Screen
4% retained on No. 100 Screen
85% retained on No. 140 Screen
Max 5% thru a No. 230 Screen

30



All pass No. 16 Screen
10% retained on No. 20 Screen
90% retained on No. 35 Screen
Max 5% thru a No. 45 Screen

120



All pass No. 70 Screen
15% retained on No. 120 Screen
75% retained on No. 170 Screen
Max 5% thru a No. 270 Screen

36



All pass No. 18 Screen
8% retained on No. 25 Screen
94% retained on No. 40 Screen
Max 5% thru a No. 50 Screen

150



All pass No. 80 Screen
10% retained on No. 140 Screen
76% retained on No. 230 Screen
Max 5% thru a No. 325 Screen

46



All pass No. 25 Screen
19% retained on No. 40 Screen
80% retained on No. 50 Screen
Max 5% thru a No. 70 Screen

180



All pass No. 80 Screen
7% retained on No. 170 Screen
39% retained on No. 230 Screen
24% thru a No. 270 Screen

54



All pass No. 30 Screen
8% retained on No. 45 Screen
86% retained on No. 60 Screen
Max 5% thru a No. 80 Screen

220



All pass No. 100 Screen
7% retained on No. 200 Screen
48% retained on No. 270 Screen
25% thru a No. 325 Screen

60



All pass No. 35 Screen
20% retained on No. 50 Screen
78% retained on No. 70 Screen
Max 5% thru a No. 100 Screen

240



All pass No. 120 Screen
4% retained on No. 200 Screen
21% retained on No. 270 Screen
50% thru a No. 325 Screen

70



All pass No. 40 Screen
10% retained on No. 60 Screen
74% retained on No. 80 Screen
Max 5% thru a No. 120 Screen


* For allowable grading limits, refer to ANSI B74.12-2001 Table 3

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