Gilsonite Specification
Gilsonite Specification
Gilsonite is very fragile. It shatters easily. Rolling the Gilsonite between two drums tends to give the best particle distribution to use as raw material in carbon production.
Normal Specification of Gilsonite with out any refining on it would be as below.
Please remember that for each usage we must do some refining on Gilsonite and so its specification will change.
Physical specification:
Color in Mass Black
Color in Streak or Powder Brown – Dark Brown
Moisture Content 0.5 – 1
Specific Gravity @ 77°F 1.04-1.06
Hardness (Moh’s Scale) 2
Penetration 0
Volatility, Weight %,
5 Hours @ 325°F< 2%
5 Hours @ 400°F< 4%
5 Hours @ 500°F< 5%
Acid Value 2.3
Saponification Value 5.6
Iodine Number 0
Heat of Combustion 17,900 Btu / lb.
Heat of Fusion 9990 Btu / lb.
Specific Heat of Solid Phase 0.52 Btu / lb. / °F
Specific Heat of Liquid Phase 0.61 Btu / lb. / °F
Glass Transition Temperature, Tg 185-225 °F
Bulk Density, Lump 40 lbs. / ft3
Electrical Resistivity 4.0 x 1012 ohm-cm
Viscosity, Brookfield
@ 375°F 55,000 cps
@ 400°F 22,800 cps
@ 425°F 6,600 cps
@ 450°F 2,800 cps
Chemical specification:
Moisture (AGC Method) 0.5-1%
Penetration (25 C, 100 gm, 5 sec.) 0
Color in Mass Black
Sulfur 3-3.3%
Specific Gravity 1.05
Fixed Carbon 15%
BTU per pound 16,000-18,000
Volatile Combustible Matter at 1900 F, ASTM D271-475-81%
Lustrous Carbon Content 25-35%
Coking Value 20-25%
Typical Elemental Analysis, Weight %
Carbon 84.9%
Hydrogen 10%
Nitrogen 0.01%
Oxygen 1.4%
Trace Elements 0.1%
