| Sealrite
Expanded Graphite Material |
|
 Pure expanded mineral graphite products provides an excellent gasket material for high temperature, high pressure applications or for applications where the gasket width is relatively narrow. The material is resistant to most organic and inorganic acids and is suitable to seal a very wide range of media. It is almost completely impermeable to gases and fluids and is commonly used in very demanding application where low emission is paramount.The material have no ageing or embrittlement problems common with elastomeric based materials and displays long term stability of compressibility and recovery over a wide temperature range. Graphite however is not suitable for use with very strong oxidising compounds like highly concentrated nitric acid or chromic acid.
Expanded
Graphite Sheets
Sealrite
expanded graphite sheets is made from pure mineral graphite and
formed into sheets through a laminar process. Commonly used for
gaskets for flanges and connections in demanding application or
as an asbestos gasket substitute. Sealrite offers expanded graphite
sheets in the following styles:
Style 188: Pure homogeneous expanded mineral graphite
.This style offers the highest temperature rating for inert or reducing
environment of up to 2000oC
Style 388: Expanded mineral graphite with steel foil sheet
reinforcement
The steel foil insertion allows for better handling and higher operating
pressure
Style 488: Expanded mineral graphite with tanged stainless
steel 316 reinforcement
Stainless Steel 316 sheet allows the material to achieve substantially
higher dynamic loading giving it a high blow out resistance and
mechanical strength. The insertion also allows for better handling.
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Specifications:
|
Style
188
Homogenous
|
Style
388
SS 316 Foil Insert
|
Style
488
Tanged SS316
|
|
Density
of graphite
|
1
g/cm3
|
1
g/cm3
|
1
g/cm3
|
|
Ash
content
|
<2.0
%
|
<2.0
%
|
<2.0
%
|
|
Chloride
content
|
<30
ppm
|
<30
ppm
|
<30
ppm
|
|
Gas
permeability
|
<0.2
ml/min
|
<0.5
ml/min
|
<0.5
ml/min
|
|
Reinforced
material thickness
|
-
|
0.05mm
|
0.10mm
|
|
Operating
Temperature:
-oxidising environment
|
-200oC to 500oC
|
-200oC to 500oC
|
-200oC to 500oC
|
|
Operating
Temperature:
-inert or reducing environment
|
-200oC to 2000oC
|
-200oC to 750oC
|
-200oC to 750oC
|
|
Operating
Pressure
|
80
bar
|
100
bar
|
200
bar
|
|
Compressibility
|
45%
|
45%
|
35%
|
|
Recovery
|
13%
|
13%
|
17%
|
|
Tensile
Strength
|
4.5N/mm2
|
25N/mm2
|
25N/mm2
|
|
Standard
Dimensions
|
1m
x 1m
1.5m x 1m
|
1m
x 1m
1.5m x 1m
|
1m
x 1m
1.5m x 1m
|
|
Available
Thickness
|
0.2mm
to 3mm
|
0.8mm
to 3mm
|
1mm
to 3mm
|
|
|
| |
| Graphite
Die Formed Packing Rings
 Die
formed graphite packing rings are made from pure flexible graphite
and die formed into rings of specific dimensions. Densities ranges
from 1.6g/cm3 to 1.8 g/cm3 depending on application
requirements. They may be inserted with wire mesh or stainless steel
insertion for higher dynamic loading and better handling. The product
displays all the characteristics that make graphite such an excellent
choice as a sealing material in both static and dynamic applications.
It is very suitable for use in high temperature and pressure valves
and pumps. They are manufactured to allow ease of fitting and they
compress easily to take up the fitting space on the valve spindle
or gland housing.
|
Operating
Temperature- oxidising environment
|
-200oC
to 500oC
|
|
Operating
Temperature-inert or reducing environment
|
-200oC
to 2000oC
|
|
Operating
Pressure
|
200
bar
|
|
Density
|
1.6g/cm3
to 1.8 g/cm3
|
|
Ash
Content
|
<2
%
|
|
Chloride
Content
|
<30
ppm
|
|
|
| |
|
Expanded
Graphite Ribbon Tape
 Manufactured
from pure expanded graphite to form a flexible tape. It has excellent
sealing characteristics and high temperature resistance. It may
be used in situ by wrapping the tape to the stem of a valve or the
shaft of a pump in an emergency where the leaking component may
not be removed from service.
|
Operating
Temperature oxidising environment
|
-200oC
to 500oC
|
|
Operating
Temperature inert or reducing environment
|
-200oC
to 2000oC
|
|
Operating
Pressure
|
200
bar
|
|
Dynamic
Application Speed
|
2m/s
max
|
|
Density
|
1
g/cm3
|
|
Ash
Content
|
<2
%
|
|
Chloride
Content
|
<30
ppm
|
|
Tape
Width
|
10
mm to 40mm
|
|
Tape
thickness
|
0.4mm
|
|
Tape
length
|
20m
|
|
|
| |
|
Expanded
Graphite Knitted Tape
 Knitted
from pure flexible graphite yarn to form a very flexible high strength
tape. It has excellent sealing characteristics and high temperature
resistance. It may be used as a packing in pumps or as a seal for
expansion joints, and valves. Its high strength and heat resistance
also makes it a very suitable material for use as a seal for furnance
doors or as a manhole gasket.
|
Operating
Temperature oxidising environment
|
-200oC
to 500oC
|
|
Operating
Temperature inert or reducing environment
|
-200oC
to 2000oC
|
|
Operating
Pressure
|
250
bar
|
|
Dynamic
Application Speed
|
2m/s
max
|
|
Density
|
1.2
g/cm3
|
|
Ash
Content
|
<2
%
|
|
Chloride
Content
|
<30
ppm
|
|
Tape
Width
|
10
mm to 50mm
|
|
Tape
thickness
|
3mm
to 6mm
|
|
Tape
length
|
30m
|
|
|
| |
All
information on this web site is meant as a general guide only.
The complex nature of sealing applications does not allow any
warranty to be given on the use of the information in determining
the suitability of a product for a given application.
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