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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. 

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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