E mail: minerals@bom3.vsnl.net.in
                                                                                                                                             hindminerals@vsnl.com

 

NATURAL CRYSTALLINE FLAKE GRAPHITE WHICH IS PREFERRED FOR A NUMBER OF INDUSTRIAL  APPLICATIONS OWING TO ITS UNIQUE PROPERTIES OF GRIND ABILITY & HIGH GRAPHITE CARBON   CONTENT. ONE OR MORE OF THESE PROPERTIES MAKE GRAPHITE ESSENTIAL TO THE  MANUFACTURE OF PRODUCTS IN NEARLY EVERY MAJOR   INDUSTRY.

            1.  LUBRICITY 5.  CARBON SOURCE
            2.  FRICTION MODIFIER 6.  CHEMICAL INERTNESS
            3.  ELECTRICAL CONDUCTIVITY 7.  REFRACTORIES
            4.  THERMAL CONDUCTIVITY

NATURAL CRYSTALLINE GRAPHITE HAS A HARDNESS OF 1 TO 2 (MOHS SCALE) AND A SPECIFIC   GRAVITY OF 2.09
TO 2.25. IT HAS A METALLIC LUSTRE, SOMETIMES DULL OR EARTHY AND GIVES A   SILEVRY/BLACK STREAK.
OPTICALLY IT IS OPAQUE EVEN ON THE THINNEST EDGES.IT HAS A   PERFECT BASAL CLEAVAGE AND THIS COUPLED WITH ITS EXTREME SOFTNESS GIVES IT A SLIPPERY   FEEL. GRAPHITE MELTS AT ABOUT 3650 C. AT 600-700 C IT SLOWLY DECOMPOSES IN THE PRESENCE   OF OXYGEN TO FORM CARBON DIOXIDE. LIKE SOME FORMS OF CARBON, IT BURNS ONLY AT HIGH   TEMPERATURE. STRONG OXIDENTS SUCH AS A MIXTURE OF HOT NITRIC ACID AND  POTASSIUM   CHLORATE WILL OXIDIZE IT COMPLETELY. IT IS NORMALLY UNAFFECTED BY ACIDS, DRYCHLORINE  GAS OR MOLTEN ALKALI AT LOW RED HEAT.

 

GENERAL SPECIFICATIONS OF GRAPHITE REQUIRED BY DIFFERENT INDUSTRIES 

GRAPHITE FLAKES

FOR CRUCIBLES STOPPERS & LUBRICANTS GRAPHITE GREASES & EXPANDABLE GRAPHITE

 Grade

SPL L1

L1

L2

L3

SP/L4

 Mesh Size:

-20+50

-20+100

-50+100

-80

-100

 (Other Mesh Size on request) B.S.S Mesh B.S.S Mesh B.S.S Mesh B.S.S Mesh

B.S.S Mesh

 Fixed Carbon 85/87 %  (1) 85/90% (1) 80/85% 85/90% 92/94%
      92/94 %  (2)      (2) 85/90%  
 Moisture Max. 1% 1% 1% 1% 1%
 Volatile Matter Max. 2/3% 2/3% 2/3% 3/5% 1/2%
  Ash Balance Balance Balance Balance Balance


TOLERANCE SIZE MAX OPENING 10/15%  

GRAPHITE POWDER

FOR  LUBRICANTS, PENCIL & CARBON BRUSHES ETC.

 Grade
 
SPL High Grade SGP92
 
Pencil Grade
SGP 90
C 90
 
-100
 

 Mesh Size

    -200 or

   -200 or

-200

-200

-100

 

 -400 

-300  -325 -

-

 Other Mesh Size on request) B.S.S Mesh B.S.S Mesh B.S.S Mesh B.S.S Mesh B.S.S Mesh
  90/95% 90/95% 90/95% 90/95% 90/95%
  Passing Passing Passing Passing Passing

Fixed Carbon

94% 92/94% 90/92% 85/90% 87/90%  (1)
 
96% & 99%
     

90/94%  (2)

 Moisture Max. 1% 1% 1% 1% 1%
 Volatile Matter Max. 1% 2/3% 2/3% 2/3% 3/5%
 Ash Balance Balance Balance Balance Balance


GRAPHITE POWDER

FOR FOUNDRY FACING & PAINTS ETC.

 Grade

No. 2 No. 1 A1 S2 S1
 Mesh Size -200 -200 -200 -200 -200
 Other Mesh Size on request) B.S.S Mesh B.S.S Mesh B.S.S Mesh B.S.S Mesh B.S.S Mesh
  90/95% 90/95% 90/95% 90/95% 90/95%
  Passing Passing Passing Passing Passing
 Fixed Carbon 40/45% 50/55% 60/65% 70/75% 80/85%
 Moisture Max. 1% 1% 1% 1% 1%
 Volatile Matter Max 4 to 6% 4 to 6% 4 to 6% 3 to 5 % 3 to 5 %
 Ash Balance Balance Balance Balance Balance

                                                                       After Testing
                                                                       1) Moisture
                                                                       2) Volatile Matter
                                                                       3) Ash
                                                                       4) Balance Fixed Carbon


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