Precision-cut gaskets are supplied to all international flange standards, and custom-made gaskets are swiftly produced to order. Sheet jointings include rubber, cork-elastomer, PTFE, compressed synthetic fibre jointings, expanded graphite and many others materials.
1. CHIEFTAIN®
Our premium grade universal sheet jointing. Its formulation contains an advanced carbon fibre material and a nitrile (NBR) rubber binder. An anti-stick finish on both sides is standard.
– Carbon fibre for strength and stability.
– Multi-service marine flange sealing.
– Outstanding chemical and steam resistance.
– Service capabilities: from cryogenic up to +450°C maximum temperature, or 13MPa/130bar maximum system pressure.
– User-friendly — easy to cut, handle and remove from flanges.
Precision-cut gaskets are supplied to all international flange standards, and custom-made gaskets are swiftly produced to order. Sheet jointings include rubber, cork-elastomer, PTFE, compressed synthetic fibre jointings, expanded graphite and many others materials.
2. CENTURION®
This high-performance sheet jointing is based on glass and aramid fibres with a nitrile (NBR) rubber binder. An anti-stick finish on both sides is standard.
– Well proven on marine applications worldwide.
– Chemically and thermally stable for duties from cryogenic up to +440°C, or maximum system pressure of 12MPa/120bar.
– Non-pigmented.
How supplied
Sizes as for Chieftain® above.
3. SENTINEL®
Sentinel® is our general-purpose sheet jointing. It comprises glass and aramid fibres with a nitrile (NBR) rubber binder. An anti-stick finish on both sides is standard.
– Suitable for a wide range of duties from cryogenic up to +400°C, or maximum system pressure of 10MPa/100bar.
– Offers outstanding performance for its class.
– WRAS approved for use with cold and hot potable water up to 85°C.
How supplied
Sizes as for Chieftain® above.
4. INCA
A high quality, reliable, yet economically priced, jointing based on glass and aramid fibres with a nitrile (NBR) rubber binder. An antistick finish on both sides is standard.
– General-purpose jointing for medium duty marine applications.
– Suitable for steam, condensate, water, air, oils and solvents.
– Service capabilities: from cryogenic to +350°C or 10MPa/100bar system pressure.
– WRAS approved for use with cold and hot potable water up to 85°C.
– Excellent value for money; widely used in shipbuilding.
How supplied
Sizes as for Chieftain® on opposite page.
5. SUPAGRAF® EXPANDED GRAPHITE
Supagraf® is chemically expanded flake graphite that is calendered into sheets of controlled thickness. It is made without fillers or elastomeric content.
– Excellent chemical resistance.
– Wide temperature range — from cryogenic up to +400°C, and significantly higher under inert conditions.
– Excellent resistance to stress relaxation.
– Outstanding sealing integrity.
– Fire safe.
How supplied
Precision cut gaskets to any shape, size and quantity. In sheets:
– 0.5m x 1.0m, 1.0m x 1.0m, 1.0 x 1.5mm, and thicknesses from
– 1.0mm to 3.0mm — all dimension dependent on specific grade.
6. NEBAR®
Nebar® is the trade name for our range of cork-elastomer jointings, which are available in a wide variety of material types for different applications.
For marine duties we recommend:
Nebar® Brown — for areas where vibration is present, such as main engine/generator inspection door joints, low duty pipelines, and access flanges in engine room and hull equipment. Maximum temperature in liquids: 110°C. Maximum pressure: 0.5MPa/5bar.
How supplied
Precision cut gaskets to any shape, size and quantity. In sheets:
– 1.2m x 1.2m. Thicknesses from 0.75mm to 6.4mm.
7. GASKOID
This is a cellulose-based vegetable fibre gasket material impregnated with gelatine. It is recommended for pump and gear casings where thin gaskets are desirable, and can be used with confidence in oil cargo pipeline and manifold flanges.
– Resistant to fuels, oils, and most organic solvents.
– Maximum operating pressure 1MPa/10bar.
– Operating temperature range -20°C to +120°C.
How supplied
Precision cut gaskets to any shape, size and quantity. Sheets or rolls 1.0m wide to any length. Thicknesses 0.15mm to 3.2mm.
8. SUPER TWILSTELE® XA/G
A glass-fibre based material reinforced with stainless steel wire and proofed with synthetic rubber. It is recommended for sealing exhaust flanges of diesel engines and gas turbines.
– For dry heat applications where working pressure is low.
– Maximum operating temperature 650°C.
– Tough and flexible material that can be cut with hand tools.
How supplied
– Cut gaskets to any shape, size and quantity. Sheets 1.2m x 1.2m.
– Thicknesses in multiples of 1.3mm.
9. RUBBER SHEETING
We offer a wide range of sheet rubber jointings, available with or without fabric reinforcement. The most popular grades for marine applications are:
– Styrene butadiene & natural rubber blend (263C) for use with hot and cold water, ethylene glycol, dilute acids and alkalis. Temperature range -30°C to +70°C.
– Styrene butadiene & natural rubber insertion (332C) reinforced with one or two layers of cotton or polyester scrim insertion. For use with hot and cold water, ethylene glycol, dilute acids and alkalis, and silicone oils and greases. Temperature range -20°C to +70°C.
– Styrene butadiene & neoprene blend (264C) for use with mineral, silicone and animal-based oils and greases within temperature range -20°C to +70°C. Good resistance to ozone, sunlight and atmospheric ageing.
– Styrene butadiene & neoprene insertion (283C) — similar to above but contains one or two layers of cotton or polyester scrim insertion. Temperature range -20°C to +70°C.
How supplied
Cut gaskets to any shape size or quantity. Rolls or sheets 1.4m wide. All popular thicknesses from 1.5mm up to 6mm. Other dimensions can be supplied.
10. PTFE SHEETS & CUT GASKETS
Fluolion® is the James Walker trade name for its ranges of special PTFE grades. Virgin Fluolion and a number of filled materials are processed in house by the company.
– Outstanding chemical resistance
– Non-corrosive, non-wetting, non-contaminating and odourless.
– Tolerates temperatures between –200°C and +260°C.
– Excellent electrical and thermal insulator in virgin form.
For general gasket duties, PTFE’s impressive list of properties is often marred by creep characteristics that cause loss of sealing stress with time. James Walker minimises these negative properties by using fillers, biaxial orientation and other devices that enable the manifold advantages of Fluolion gaskets to outweigh the possible disadvantages.
– Carbon fibre for strength and stability.
– Multi-service marine flange sealing.
– Outstanding chemical and steam resistance.
– Service capabilities: from cryogenic up to +450°C maximum temperature, or 13MPa/130bar maximum system pressure.
– User-friendly – easy to cut, handle and remove from flanges.
How supplied
Precision cut gaskets to any shape, size and quantity. In sheets:
2.0m x 1.5m, 1.5m x 1.0m. Thicknesses: 0.5mm, 0.75mm, 1.0mm, 1.5mm, 2.0mm. Note: 3.0mm is also available, but is not recommended for gasket duties.