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As the interlayer combination of natural flake graphite is relatively lose, graphite inter-layer compound (Expandable graphite) can be obtained through chemical treatment or electrochemical treatment.

The expandable graphite is a kind of high-ranking sealing material. With features of heatproof, abrasive resistance, anticorrosion, oxidation resistance, great surfactivity and strong adsorbability, it is a replacement for traditional sealing materials such as asbestos, rubber and some metallic materials in making various sealing parts in pump, valve, pressure vessel and pipelines.

With high adsorbability over petroleum product (Such as heavy oil), expandable graphite is commonly used as new-type sorbent in environment protection for oil pollution in river, lake, sea and drinking water source .
 

before expansion
after expansion

This Corporation established the first production line of electrochemical technology expandable graphite in China in 1993. The superiority of expandable graphite produced by electrochemical processing is a low sulfur content.

Specifications of expandable graphite:
expansion rate
(1000℃)(cc/g)
ash(%)
PH value
moisture
(%)
volatile
matter
size
sulfur 
content
EX9950-180
180
<1
3.0-4.0
<1.0
<12.0
50mesh>80
<0.12%
EX9980-180
180
80mesh>80
EX97550-180
180
<2.5
50mesh>80
EX9550-180
180
<5
50mesh>80
EX9750-180-N
180
<3
6.7-7.5
50mesh>80
<0.20%
EX95100-110-N
110
<5
100mesh>80

In recent years, to satisfy special demands of some clients, we have developed the expandable graphite with chemical processing. Some of the products has been already exported to abroad.

Specifications of sulfur-free expandable graphite:
expansion rate
(1000℃)(cc/g)
ash(%)
PH value
moisture
(%)
volatile
matter
size
sulfur 
content
EX9950-250W
250
<1.0
3.0-4.0
<1.0
<13
50mesh>80
<0.03%
EX9980-250W
250
80mesh>80
EX9750-200NW
200
<3.0
6.5-7.5
50mesh>80
EX9750-200AW
200
<3.0
10-12
50mesh>80
EX9780-200NW
200
<3.0
6.7-7.5
80mesh>80
EX9780-200AW
200
<3.0
10-12
80mesh>80

 

Flexible Rolled Graphite Sheet

Uses:
Pressed into packing rings. 
Ready-made gaskets used in static sealing. 
Conforming and sticking to metallic surfaces to improve sealing. 
Milled and cut into tapes of various sizes. 
Packing for metal spiral wound gaskets.

Type:
Length(m/roll)
Width(mm)
Thickness(mm)
30-80
300-1000
0.20-0.90

Main properties for the flexible graphite:
Density
0.7-1.1 g/cc
Carbon content
>98.0 %
Sulphur content
<1400&<200 ppm
Chloride content
<50 ppm
Fluoride content
<50 ppm
Compressive
>48 MPa 
(DIN 52913)
Compressibility
35-55 % 
(ASTM F-36)
Recovery
>10.0 % 
(ASTM F-36)



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