MICA SPLITTING

Mica has nearly perfect basal cleavage which permits it to be split into thinnest sheets, as low as, .0002 to .0003 inches without any crack or breakage, which in turn helped it to maintain a position of paramount importance as an insulating material.

STANDARD GRADING TABLE FOR MUSCOVITE MICA SPLITTINGS
GRADE
QUALITY
AREA OF USABLE
RECTANGLE+
MINIMUM DIMENSION OF ONE SIDE OF USABLE RECTANGLE
THICKNESS OF 10 SPLITTINGS
sq                   cm
sq               cm
cm
inches
mm
inches
No 2 Book Form Dusted Loose   96.8   tlt* 154.8
  96.8   tlt   154.8 		    15   tlt* 24
    15   tlt   24
5.1
 5.1
  2
  2 		     0.15 to 0.23
     0.15 to 0.23
0.006 to 0.009
0.005 to 0.009
No 3 Book Form Dusted Loose   64.5   tlt     96.8
  64.5   tlt     96.8
    10   tlt   15
    10   tlt   15
5.1
 5.1
  2
  2
0.15 to 0.23
0.15 to 0.23
0.006 to 0.009
0.006 to 0.009
No 4 Book Form Dusted Loose   38.7   tlt     64.5
  38.7   tlt     64.5		       6   tlt   10
      6   tlt   10
3.8
 3.8
  15
  15
0.15 to 0.23
0.15 to 0.23
0.006 to 0.009
0.006 to 0.009
No 4.5 Book Form Dusted Loose   28.8   tlt     38.7
  28.8   tlt     38.7 		   4.5   tlt     6
   4.5   tlt     6
3.2
 3.2
  1.25
  1.25
0.15 to 0.23
0.15 to 0.23
0.006 to 0.009
0.006 to 0.009
No 5 Book Form Dusted Loose   19.4   tlt     38.7
  19.4   tlt     38.7 		      3   tlt     6
      3   tlt     6
2.5
 2.5
  1
  1
0.15 to 0.23
0.15 to 0.23
0.006 to 0.009
0.006 to 0.009
No 5 Top Book Form Dusted Loose   14.5   tlt     19.4
  14.5   tlt     19.4 		2.25   tlt     3
2.25   tlt     3
2.2
 2.2
  0.875
  0.875
0.15 to 0.23
0.15 to 0.23
0.006 to 0.009
0.006 to 0.009
No 5 Book Form Dusted Loose   12.8   tlt     19.4
  12.8   tlt     19.4 		      2   tlt     3
      2   tlt     3
2.0
 2.0
  0.8
  0.8
0.15 to 0.23
0.15 to 0.23
0.006 to 0.009
0.006 to 0.009
No 6 Book Form Dusted Loose     6.4   tlt     12.8
    6.4   tlt     12.8 		      1   tlt     2
      1   tlt     2
1.9
 1.9
  0.75
  0.75
0.18 to 0.25
0.18 to 0.25
0.007 to 0.009
0.007 to 0.009
No 6 First Loose
To pass over a screen having 2.2 sq cm or 0.875 sq inch openings.
0.18 to 0.28
0.007 to 0.011
No 6 Second Loose
To pass over a screen having 1.6 sq mm or 0.625 sq inch openings.
0.18 to 0.28
0.007 to 0.011
No 6 Third Loose
To pass over a screen having 1.3 sq cm or 0.50 sq inch openings
0.18 to 0.28
0.007 to 0.011
No 6 Cheap Loose
To pass over a screen having 064 sq cm or 0.25 sq inch openings
0.18 to 0.30
0.007 to 0.012

+        The area specified refer to the maximum usable rectangle (usable area) that may be cut from the specimen and not on the total area. The sheets shall not be of minimum area specified but shall contain a fair proportion of sizes throughout the specified range

*       tit to less than

MICA MANUFACTURING CO. PVT.LTD.

3C, Camac Street, P.O.Box 9052,
Calcutta 700 016 INDIA
Tel: +91-33-2229-2277/2229-4505
Fax:+91-33-2229-5216/2474-7959

  E-mail :micamafco@vsnl.net