Graflake

Flake grade graphite products in diversified carbon contents, average particle size larger than 150 microns (100 mesh ASTM)

The Graflake product line is a natural crystalline graphite with an average particle size larger than 150 microns (100 mesh ASTM) and carbon ranging from 87% to 99.9%.

Graflake is produced from ore extracted from the mines of Pedra Azul and Salto da Divisa, both located in the north of the State of Minas Gerais, a region in which Nacional de Grafite holds the rights to exploit one of the world’s largest reserves of crystalline natural graphite.

Near each mine, Nacional de Grafite has a modern concentration plant, in which the graphite is separated from the impurities by mechanical concentration processes, preserving the original characteristics of graphite.

The Graflake line is the right solution for:

  • Magnesia-Carbon Refractories;
  • Alumina-carbon Refractories;
  • Special refractories for continuous casting systems;
  • Crucibles;
  • Raw material for the production of expandable and expanded graphite.
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Chemical Properties

Products Parameters
Carbon % Ash % Moisture %
Graflake 87100 G ≥ 87,0 ≤ 13,0 ≤ 0,3
T 90,0 10,0 0,1
Graflake 8780 G ≥ 87,0 ≤ 13,0 ≤ 0,3
T 90,3 9,7 0,2
Graflake 8860 G ≥ 88,0 ≤ 12,0 ≤ 0,3
T 91,0 9,0 0,2
Graflake 94140 G ≥ 94,0 ≤ 6,0 ≤ 0,3
T 95,1 4,9 0,1
Graflake 94140 di G ≥ 94,0 ≤ 6,0 ≤ 0,2
T 95,2 4,8 0,1
Graflake 9480 G ≥ 94,0 ≤ 6,0 ≤ 0,3
T 94,9 5,1 0,2
Graflake 9580 G ≥ 95,0 ≤ 5,0 ≤ 0,3
T 96,0 4,0 0,1
Graflake 98100 G ≥ 98,0 ≤ 2,0 ≤ 0,3
T 98,7 1,3 0,1
Graflake 9880 G ≥ 98,0 ≤ 2,0 ≤ 0,3
T 98,6 1,4 0,1
Graflake 9980 G ≥ 99,0 ≤ 1,0 ≤ 0,3
T 99,4 0,6 0,1
Graflake 9950 G ≥ 99,0 ≤ 1,0 ≤ 0,3
T 99,4 0,6 0,1
Graflake 99550 G ≥ 99,5 ≤ 0,5 ≤ 0,3
T 99,8 0,2 0,1

Physical Properties

Mesh size Accumulated Retained in %
30# 35# 40# 50# 60# 70# 80# 100# 140# 200# Bulk Density (g / cm³)
µm 600 500 425 300 250 212 180 150 106 75
Graflake 87100 G * * * * * * * ≥ 80,0 * * *
T 09 – 4,8 18,6 33,8 51,3 68,7 86,1 95,9 98,2 0,56
Graflake 8780 G * * * * ≥ 60,0 * ≥ 85,0 * * ≥ 97,0 *
T 8,4 – 30,0 62,4 76,5 84,8 90,0 94,6 98,1 98,9 0,52
Graflake 8860 G * * ≥ 25,0 * ≥ 80,0 * * * ≥ 97,0 * *
T 10,8 – 39,0 72,4 85,5 91,8 95,3 97,4 98,7 99,7 0,51
Graflake 94140 G * ≤ 7,0 * * * * * 10*60 ≥ 60,0 * *
T 0,4 0,8 2,3 8,5 15,2 25,6 36,3 52,9 69,4 81,5 0,49
Graflake 94140 di G * ≤ 10,0 * * ≥ 25,0 * * * ≥ 70,0 * *
T 1,7 3,6 8,6 22,5 31,3 40,9 48,9 60,0 75,0 85,8 0,42
Graflake 9480 G * * * * * * ≥ 80,0 * * * *
T 2,4 – 14,2 44,0 61,1 75,2 85,5 91,7 97,0 99,0 0,47
Graflake 9580 G * * * * * * ≥ 80,0 * * * *
T 0,9 – 5,4 23,3 42,3 64,7 84,7 95,1 99,4 99,8 0,52
Graflake 98100 G * * * * * * * ≥ 80,0 * * *
T * – 2,7 15,0 30,8 55,2 69,4 86,0 95,2 98,1 0,47
Graflake 9880 G * * * * * * ≥ 80,0 * * * *
T 1,9 – 10,0 31,9 51,0 70,8 84,2 94,7 99,0 99,5 0,50
Graflake 9980 G * * * * * * ≥ 80,0 * * * *
T 1,4 – 6,3 31,2 59,3 72,4 84,7 91,8 96,7 98,5 0,49
Graflake 9950 G * * * ≥ 80,0 * * * * * * *
T 11,4 – 47,4 87,1 94,7 97,8 98,7 99,3 99,7 99,8 0,47
Graflake 99550 G * * * ≥ 90,0 * * * * * * *
T 19,0 – 58,8 93,3 97,5 99,2 99,5 99,7 99,8 99,9 0,48
* = Not specified T = Typical value G = Guaranteed limits