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Fluolion® Envelope Gaskets

Description
A resilient fibre material encased in a thin cover of PTFE. The resulting gasket combines the inertness of virgin PTFE with the mechanical properties of the compressed fibre sheet.

James Walker supplies three envelope designs: Fin Type; Machined Square Type; and Folded Tape Type.

Typical applications
Flanged joints handling highly aggressive fluid media that would otherwise swiftly destroy the integrity of other materials. Often used with soft insert material on glass-lined pipework systems. Also used in food processing, where cleanliness and non-contamination are essential.

Fin Type

• Standard design: most economical envelope gasket.
• Suits majority of applications where highly abrasive madia are not used and turbulent flow will not create problems. 
• Needs clearance between insert and envelope inside diameter to enable insert to be fitted.

Machined Square Type

• Provides continuity with pipeline bore for smooth flow.
• Recommended where flange sealing width is restricted or thick inserts are used.
• Supplied with serrated surface.

Folded Tape Type

• Has smooth surface finish - tape of PTFE is folded and joined by welding.
• Used for diameters over 300mm.
• Can be adapted to non-circular planforms.

Materials
Covers: virgin Fluolion^® PTFE. 
Inserts: compressed non-asbestos fibre, synthetic rubber-proofed woven cloth, and lamninated combinations of these.

Service capability
Maximum temperature: typically +260°C for PTFE envelope (but dependent on filler material).

How supplied
Custom made to suit all standard flanges and and non-standard shapes. 

Click here to download a pdf of the Gaskets & Jointings guide.

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