Innovative Sheet Gasket for High Temperatures and Pressures

Expanded Graphite is the most commonly used sealing material for high temperature applications. It is employed in the construction of a wide variety of styles including flat sheet gaskets, semi-metallic gaskets such as spiral wound, compressed valve packings and die pressed rings; it is the sealing material of choice for the refining, petrochemical and power industries.

When manufactured as sheet material, a reinforcement material is required to improve handleability. The reinforcement can be either metal foil, which is bound to the graphite with an adhesive, or tanged, which a perforated metal sheet that is mechanically bond to the graphite layers. While both forms are suitable for general industrial use, they cope less well in arduous conditions of high temperature and pressure; the user is then limited to semi-metallic gaskets for these applications which can be expensive, and are difficult to fabricate in complex shapes or in thin sections.

PG-ML is an innovative gasket sheet made ​​of several layers of stainless steel and high oxidation-resistant flexible graphite. The layers of graphite and stainless steel sheets are bonded to each other using a specialised adhesive free process and the outer layers are impregnated to reduce leakage and improves handling. The result is a product which is able to operate in conditions well beyond the scope of the traditional reinforced graphite gaskets. It can accommodate pressures of up to 250 bar and operating temperatures of  between -2500C to 5000C, and has improved handling and scratch resistance due to the special impregnation.

PG-ML finds applications in tongue and groove flanges, heat exchangers, sight glasses and O.E.M. equipment. It is also suitable for common pipework and vessel designs.  Its properties benefit the chemical, refining and nuclear industries, as well as OEMs such as pump, valve and turbocharger application.

For details contact Dr Gavin Smith, The Phoenix Group at gsmith@phoenixsealing.co.uk

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Water Industry Gaskets & Products

Phoenix is a leading supplier of gaskets to the water industry. Our range of WRAS approved seals are available from stock and are fully supported by our knowledgeable and friendly team who are always on hand to offer application advice.

There are three major products in our range:

EPDM

A high quality elastomer with good physical properties that meets the requirements of BS 6920-1:2000 and BS EN 681-1 (cold potable water supply 23°C). The materials possess excellent ageing and ozone resistance and is the material of choice for the UK potable water industry.

EPDM (WRAS) is suitable as a gasket for both metallic and non-metallic flanges to a working pressure rating of 16 bar. Maximum operating temperature is typically 100°C.

PG-X

A WRAS approved, premium grade of compressed fibre sheet material based on aramid and inorganic fibres with a high quality nitrile binding system. The material meets the requirements of BS 7531 Grade X and has outstanding mechanical properties and excellent temperature resistance. As well as potable water, it is suitable for many fluids including hydrocarbons, steam, gases, dilute acids and alkalis.

PG-X is suitable for metallic flanges to a working pressure of over 60 Bar and a maximum operating temperature in excess of 200°C (operating temperatures and pressures are dependent on application).

PG-X Technical Datasheet

PG-E

An economic, general purpose gasket material, approved by WRAS for use with drinking water. Suitable for a wide range of fluids including oils, water, solvents, gas, low pressure steam and many chemicals in applications of moderate temperatures and pressures.

PG-E is suitable for metallic flanges to a working pressure of 40 Bar and a maximum operating temperature 150 °C (operating temperatures and pressures are dependent on application).

For further information on our WRAS range of materials or for any assistance on selection or assembly, please contact Phoenix Technical.

PG-E Technical Datasheet

 

 

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