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Gaskets and Sheet Jointings

Flange insulation sets

Our flange insulation sets comprise an electrically insulating flange gasket, plus insulating bolt sleeves and washers to prevent electrical conduction through the bolts.

They are used in cathodic protection systems and to help eliminate galvanic corrosion, as well as reducing the risk of eddy current build up.

Typical applications
Long distance pipelines for water, oil or gas.


  • Gaskets, standard: neoprene-faced phenolic. Other materials: reinforced phenolic with nitrile seals; high dielectric strength CNAF; glass-reinforced epoxy with fluoroelastomer seals.
  • Insulation washers, standard: reinforced phenolic. Other material: glass-reinforced epoxy.   
  • Sleeves, standard: polyester or DuPont™ Mylar®. Other material: DuPont™ Nomex®.
  • Back-up washers: zinc plated carbon steel or stainless steel.

How supplied
Four designs of set that cater for many different flange sizes, specifications and arrangements - including those with O-ring grooves or handling very high pressures.

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