STANDARD GRADING (SIZES) FOR NATURAL SHEET MICA OR BLOCKS

ASTM Grade Size
Area of minimum Rectangle
Minimum dimension of one side
OOEE SPECIAL
OOEE SPECIAL
EE SPECIAL
E SPECIAL
A-1 (SPECIAL)
NO. 1
NO. 2
NO. 3
NO. 4
NO. 5
NO. 5 1/2
NO. 6
Sq.In
Equivalent
Sq Cm
100
650
80
520
60
390
48
310
36
235
24
155
15
97
10
65
6
40
3
20
2 1/2
15
1
6.5
Inch
Cm
4
10.0
4
10.0
4
10.0
4
10.0
3 1/2
8.8
3
8.8
2
5.0
2
5.0
1 1/2
3.8
1
2.5
7/8
2.2
3/4
1.9

 


     
           
           

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