Carbon based materials of construction

GT is expert in manufacturing and designing of carbon based materials for many applications.

Graphite is characterized by its high level of corrosion resistance and its thermal conductivity is much greater than most comparable corrosion resistant materials.

It is commonly believed that impregnation process does change the inner thermal conductivity of graphite. That’s wrong because air is replaced by resin during the impregnation process. Air is worst conductor than resin.

What could reduce the heat conductance of the material is the remaining layer of resin on the surface of the graphite if any,

Manufacturing process, of graphite raw material, requires a lot of energy during compression, baking and graphitization. A very long process which can take several months.

GT use 3 types of graphite combined with 3 type of impregnant.

Coarse grainFine grainUltrafine grain
Grain size0.80 – 0.50 mm0.043 – 0.020 mm0.010 – 0.004mm
ProcedeExtrudedCompression molding or isomoldingIsomolding *
Density (1)1.71 – 1.751.72 – 1.901.75 – 1.92
Thermal conductivity90 – 130 W/mK90 – 130 W/mK90 – 130 W/mK
Mechanical resistanceMedium (1)High to very highVery high
Corrosion resistanceHighHighHigh
OriginWorldwideWorldwideTOYO TANSO or SINOSTEEL
Price ratio1.01.3-2.01.5/3.0
  • Densified after graphitization

Impregnation process consist to fill the inner porosity of graphite (which is between 5 to 20% depending of the grade) with another material. Usually liquid resins are forced to penetrate into this porosity through the action of pressure and time. Hereunder a comparison between impregnaiton of 2 types of graphite structure.

For chemical processes equipment GT supply 5 main grades of graphite materials.

Type graphiteCoarse grainFine / Ultra fine grainFine / Ultra fine grainStandard /Fine/Ultra fine grain
Relative mechanical resistance11.5 – 31.5-1.81.5 – 2.5
Corrosion resistanceGoodBetterExcellentExcellent
Thermal shock resistanceLowBetterExcellentExcellent
Recommended for…Mild operating conditions (pressure, temperature, corrosion)Higher pressure and temperature.  Frequent thermal cyclesHighest corrosion (oxydative media)Highest corrosion and temperature (non oxydative media)
Temp max (°C)160-180180-220300500 / 1500
Price ratio equipment (approx.)11.2-1.51.5-3.01.5-3.0

Get in touch here with us to know more.

Download brochures of Materials GT KELITE/ GT CARB/ GT FLON/ GT OXYFLON here