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.

COMPOSITION ANALYSIS

Brown Aluminum Oxide

 

AL2O3

96.12%

TiO2

2.70%

SiO2

.67%

Fe2O3

.11%

Other Oxides

.40%

 

HARDNESS COMPARISONS

Blasting Media

MOHS Value*

Knoop Value**

Diamond

10.0

7000

Brown Aluminum Oxide

9.0

2100

Garnet

7.0

1360

Quartz

7.0

820

Sand

6.0

560

* 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 Size

Inches (average)

Microns (average)

16

0.043

1092

20

0.037

940

24

0.027

686

30

0.022

559

36

0.019

483

46

0.014

356

54

0.012

305

60

0.010

254

70

0.008

203

80

0.0065

165

90

0.0057

145

100

0.0048

122

120

0.0040

102

150

0.0035

89

180

0.0030

76

220

0.0025

63

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