Description
As the name suggests, our Lofilm^® multi-lip seal is designed for reliable long-term duties with the absolute minimum thickness of stable fluid film on the dynamic contact surface.

The seal comprises a robust gland ring (female adapter), one or more V-shaped intermediate rings, and a header ring. This header ring is a positive seal, precision moulded with a knife-cut sealing edge to give maximum integrity and an annular groove to increase response to applied pressure.

Special features

• Highly versatile rod/gland seal that reduces stockholding requirements.
• Excellent performance at high and low pressures.
• No axial compression - no in-service adjustment needed.
• Very low leakage rate to reduce clean-up and costly fluid top-up requirements. 
• High performance, extrusion resistant materials for longer life.
• Can be supplied with Self-aligning Gland Ring for arduous duties and use with heavily worn rams. 

Typical applications
With its 'dry' running characteristics, Lofilm^® is the high performance seal most suitable for virtually all types of hydraulic press (main rams and drawback rams), hydraulic cylinder glands and single acting piston heads, and hydraulic valves. 

Operating capabilities

• Maximum operating pressure: 420bar (to ISO5597, but modified design and materials can considerably extend this capability).
• Temperature range: -20°C to +100°C (up to 250mm OD) or to +120°C (above 250mm OD). Special materials allow operation up to +200°C.
• Maximum surface speed: 0.5m/s (for higher speeds please consult our Technical Services Team).

Materials of construction (up to 250mm OD)
Gland ring/female adapter (standard material): high performance acetal copolymer.
Gland ring/female adapter (special materials): cotton fabric proofed with natural rubber NR, hydrogenated nitrile HNBR, butyl IIR, or fluorocarbon FKM.
V-shape intermediate rings (standard material): cotton fabric proofed with blend of synthetic rubbers.
V-shape intermediate rings (special materials): cotton fabric proofed with natural rubber NR, hydrogenated nitrile HNBR, butyl IIR or fluorocarbon FKM. Also solid rubber or PTFE.
Header/male adapter (standard material): abrasion resistant medium nitrile NBR rubber.
Header/male adapter (special materials): ethylene propylene EPD or fluorocarbon FKM rubber for use with phosphate ester fluids.

Materials of construction (above 250mm OD)
Full specifications provided on request.

Media capabilities
Our standard materials are suitable for use with most mineral based hydraulic fluids, most fire-resistant fluids of the water/oil or water/glycol types at temperatures up to 100°C, and resist most lubricating oils, greases, air and water. Where fire-resistant fluids are used it is essential to advise us of the type and designation due to the variable effects that can occur with different grades.

Alternative (special) materials are available that considerably extend the range of application in terms of temperature, fluid compatibility and abrasion resistance.

How supplied
Available in radial sections from 4mm upwards. Endless rings available up to 2250mm OD. Ex-stock in endless form with standard materials to suit housings to ISO5597. Other sizes manufactured to order.