Standard Sizes of Mica

 

From time to time, various documentation has been made for the purpose of classification of the various sizes and qualities of mica. The most popular ones are :-

1)  Methods for grading and classification of muscovite mica blocks, thins and films - Bureau of Indian Standards, New Delhi.

2)  Visual classification for muscovite mica blocks, thins and films - British Standards Institute

3)  Specifications for natural muscovite mica based on visual quality - American Society for Testing Materials.

4)   Russian standard specifications.

 

ASTM (USA)

Area of minimum Rectangle

Minimum dimension of one side

Sq. In.

Equivalent Cm

Inch

Equivalent Cm
OOEE Special

100

650

4

10.0

OEE Special

80

520

4

10.0

EE Special

60

390

4

10.0

E Special

48

310

4

10.0

A-1 (Special)

36

235

8.8

No. 1

24

155

3

8.8

No. 2

15

97

2

5.0

No. 3

10

65

2

5.0

No. 4

6

40

3.8

No. 5

3

20

1

2.5

No. 5½

15

7/8

2.2

No. 6

1

6.5

¾

1.9

 
Co-Relation of Quality Standards
 

ASTM Grade size

AJHARKHAND (BIHAR)/ RAJASTHAN

ANDHRA PRADESH

V1   CL   Clear*   ---
V2   CL&SS   Clear & Slightly stained   Green CL I
V3   FS   Fair Stained*   ---
V4   GS(I)   Good Stained (ISI)   ---
V4A*   GSM   Good Stained M   Green CL II
V5   STD.A   Stained A*   Ruby AQ
V5A*   STD.I   Stained 1st   ---
V6   STD.B   Stained B   Ruby BQ/Green BQ
V7   HS   Heavily Stained   ---
V8   DS   Densely Stained   ---
V9   Spotted I   Spotted 1st   Spotted I
V10   Spotted II   Spotted 2nd   Spotted II
V10A*   RED STD   Red/Copper stained   Red/Copper stained
---   Washer   Washer   ---
NB Codes marked with * are not prevalent

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