Ultrathan® O-rings are made from an in-house developed polyurethane compound with a very low compression set. This low compression set made it possible to produce polyurethane O-rings. An O-ring made of polyurethane material is more resistant to extrusion than standard O-rings, so that it may be favourably used in all applications with very high pulsating pressures, or with restricted housing space not allowing the use of back-up rings. Due to the high abrasion resistance, polyurethane O-rings are well suited for dynamic applications. Very good results have been achieved e.g. with air valves sealing at pilot pistons or at the main spool dynamic sealing system. Also in applications with short stroke positioning and clamping cylinders, and in valves for systems operated with poorly lubricating HFA fluids. Polyurethane O-rings are used for control purposes; an example is the crossing of drill ports during which O-rings made of rubber elastomers are vulnerable to abrasive wear, significantly shortening their service life.

• Robust seal profile for harshest operating conditions.
• Extreme wear resistance.
• Suitable for fully automatic installation
• Insensitive to pressure peaks.
• High extrusion resistance.
• Excellent media resistance in case of suitable compound selection.
• Suitable compounds available for special requirements of the chemical process industry.
• Suitable compounds available for special requirements of the food processing industry.
• Installation in closed and undercut housings.
• Can be used in existing O-ring grooves.
• Further dimensions of machined series with short lead times available.

Range of application:
The Ultrathan® O-rings are used when the physical properties of other compounds are insufficient.
Mainly for the sealing of cylinders, controls and valves.

O-ring Praedifa series V1 is available in the following compounds:
P4300, P5000, P5001, P5007, P5008, P5009, P5010, P5011, P5012, P5018, P5029, P5030, P5070, P5075, P5080, P5203, P5208, P5212, P5600, P6000, P6030