Semi Materials Co., Ltd.

Graphite heating elements and shields for fibre optic technology

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Semi Materials Co., Ltd.
[Korea]

Address
Lojit venture bldg 4F, 22-2 Sunae-Dong, Bundang-Gu,  Sungnam-City Gyeonggi-do
Phone
82-31-7118978
Contact name
Mike. Jung

Description

For producing fibre preforms and also drawing glass rods into thin light conducting fibres, heating equipments are necessary.
For the latter duty graphite has been especially successful.

As well as various design of heating elements, graphite shields are used.

Properties

-oxidation resistance
-high density
-homogeneous structure
-high purity

Grade recommendation

R6340P, R6400P, R6500P

Physical properties of purity graphite (averages)

Physical Property
R6340
R6400
R6650
Density (g/cm3)
1.73
1.78
1.85
Porosity(open) (%)
15
14
10
Hardness Rockwell B (HR)
80
10/100
100
10/100
90
5/100
E-Modulus(N/mm2)
11000
13000
13500
Flexural Strength (N/mm2)
45
45
65
Compressive Strength (N/mm2)
90
105
150
Specific Electrical Resistance(mWm)
14
12
14
Thermal Expansion
(20~1000°C ; x10-6K-1)
4.0
5.3
5.0
Thermal Conductivity (W/mK)
90
105
90
Pressing Method
Isostatic Molded
WG : with grain.
AG : against grain.
If not stated otherwise, all values are measured with a test piece the axis of which is cut with grain.

Typical analysis
Element Concentration
-
code
Ash
Value
Al
B
Ca
Co
Cr
Cu
Fe
K
Mg
Mn
Na
Ni
P
S
Si
Ti
V
High purity
P
20ppm
<0.1
1
1
<0.1
<0.1
0.2
0.5
<1
0.15
<0.1
<1
<0.1
<0.3
<2
<2
0.5
0.2
Super
pure
S
5ppm
<0.1
0.05
0.3
<0.1
<0.1
0.1
0.3
<1
0.05
<0.1
<1
<0.1
<0.3
<2
0.5
0.3
0.1


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