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US Grading System

Powder Size Specifications of the Federation of
European Producers of Abrasive Products (FEPA)

FEPA P-Grading System

Standard Testing Sieve Apertures




US Grading System
Grade No.
US Standard
Micron Range
Mesh Sizes
1/4
0-1/2
60,000
1/2
0-1
25,000
1
0-2
10,000
2
1-3
9,000
3
2-4
8,500
4
2-6
6,000
6
4-8
3,000
9
6-12
1,800
12
8-15
1,500
15
10-20
1,200
17
15-20
1,100
20
15-25
1,000
25
20-30
880
30
22-36
600

Grade No.
US Standard
Micron Range
Mesh Sizes
35
30-40
500
45
36-54
450
400
35/45
325/400
320
45/53
270/325
240
53/63
230/270
220
63/75
200/230
180
75/90
170/200
150
90/106
140/170
120
106/125
120/140
110
125/150
100/120
105
150/180
80/100
100
180/250
60/80
60
250/300
50/60
46
300/425
40/50
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Powder Size Specifications of the Federation of
European Producers of Abrasive Products (FEPA).
Grit size
3% max.,
larger than,
mcm
50% min.,
in size range,
mcm
94% min.,
larger than,
mcm
Grit size
3% max.,
larger than,
mcm
50% min.,
in size range,
mcm
94% min.,
larger than,
mcm
F12
2000
N/A
1400
F120
125
N/A
90
F14
1700
N/A
1180
F150
106
N/A
63
F16
1400
N/A
1000
F180
90
N/A
53
F20
1180
N/A
850
F220
75
50.0-56.0
45
F24
850
N/A
600
F240
70
42.5-46.5
28
F30
710
N/A
500
F280
59
35.0-38.0
22
F36
600
N/A
425
F320
49
27.7-30.7
16.5
F40
500
N/A
355
F360
40
21.3-24.3
12
F46
425
N/A
300
F400
32
16.3-18.3
8
F54
355
N/A
250
F500
25
11.8-13.8
5
F60
300
N/A
212
F600
19
8.3-10.3
3
F70
250
N/A
180
F800
14
5.5-7.5
2
F80
212
N/A
150
F1000
10
3.7-5.3
1
F90
180
N/A
125
F1200
7
2.5-3.5
1
F100
150
N/A
106




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FEPA P-Grading System
P Grade D50 Size In Microns FEPA Grade (ref.)
P150 100+/-2.0 F180
P180 77+/-2.0 F220
P220 60+/-2.0 n/a
P240 58.5+/-2.0 F220
P280 52.5+/-2.0 n/a
P320 46.2+/-1.5 F240
P360 40.5+/-1.5 F280
P400 35.0+/-1.5 n/a
P500 30.2+/-1.5 F320
P600 25.8+/-1.0 n/a
P800 21.8+/-1.0 F360
P1000 18.3+/-1.0 F400
P1200 15.3+/-1.0 n/a
P1500 12.6+/-1.0 F500
P2000 10.3+/-0.8 F600
P2500 8.4+/-0.5 n/a
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Standard Testing Sieve Apertures
ASTM Sieve No.
ASTM Mesh Opening (mm)
Nearest Tyler Sieve Mesh No.
Tyler Mesh Opening (mm)
3
6.35
3
6.68
4
4.76
4
4.70
6
3.36
6
3.33
8
2.38
8
2.36
12
1.68
10
1.65
16
1.19
14
1.17
20
0.84
20
0.83
30
0.59
28
0.59
40
0.42
35
0.42
50
0.297
48
0.295
70
0.149
100
0.147
100
0.105
150
0.104
200
0.074
200
0.074
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