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Rigid board - Insultion material for vacuum furnaces

Graphite boards

Available types of graphite boards :

  • plain (without coating)
  • one side foil
  • both sides foil
  • one side CFC plate
Feature Unit direction value
Density g/cm³ 0,17
Thermal conductivity W/m°C w/g
a/g
1000C : 1,10 2000C : 1,16
1000C : 0,59 2000C : 0,89
Flexual strength MPa w/g
a/g
1,0
1,0
Compressive strength MPa w/g
a/g
0,62
0,36
Elect. resistivityµΩcm w/g
a/g
10,7 x 10-4
30,1 x 10-4
CTE k x 10-6 / °C w/g
a/g
2,9
2,6
Porosity % 83
Ash content % <0,1

w/g = with grain
a/g = against grain

Thermal conductivity within inert gas

Thermal expansion

Soft felt - graphite and carbon

Feature Unit Temp. (°C) Carbon Graphite
Density g/cm³ 20 0,09 0,08
Shrinkage % 20 1 n/a
Water absorption % 20 1 n/a
Min. Carbon content % 99,0 99,9
Ash content % 0,25 0,02
Specif. Heat J/g/°C 20 0,71 0,71
Middle specif. heat J/g/°C 1400 1,67 1,67
Emissivity 0,99 0,99
Sublimate temp. °C 3600 3600
Superficial area m²/g 20 0,6 0,7
Thermal conductivity W/m*k 1000 1400 0,25 0,43
Vapour microns 2270; 2440; 2620 1; 10; 100 1; 10; 100
Min. Process temp. °C 1400 2500
Dimensions
Width mm 1200 1200
Thickness mm 5 oder 10 5 oder 10
Length m 5mm = 30m 10mm = 15m 5mm = 30m 10MM = 15m

Mostle above mentioned materials are used in vacuum furnaces. For heat treatment also other graphite parts are needed. Please send us your inquiry, we will provide you with our quotation.