Back-Up Rings are used for static and dynamic applications in connection with O-Rings, to prevent extrusion of the O-Ring into the diametrical clearance. The single cut and spiral design rings are easily installed into closed grooves while the single solid designs, recommended for highest pressures, are for installation in open grooves.

We recommend to specify Back-Up Rings when at least one of the following working conditions is present in cases where the intention is to seal with O-Rings only:

• pressure above 50 bar;
• diametrical clearance exceeding 0,25 mm at p > 10 bar;
• high stroke frequency;
• high temperatures;
• contaminated medium;
• strong pressure pulsing or pressure changes.

Producers of rotary transmissions prefer simplified seal designs. This can be achieved by means of an internally sealing rotary sealing set. It consists of wear resistant glide rings of low friction and an O-Ring as energizer. The rotary sealing set is suitable mainly for applications where the pressure alternates from one side of the seal to the other, such as pivots for rotating track rings, swivel joints, hose reels, and in machine tool hydraulics. If the sealing set is used as an end seal, it is recommended to install a wiper ring at the end of the components.

The function of wiper rings is to prevent dust, dirt, grains of sand and metal dwarf from penetrating into axially moving rods and plungers. Thus the development of scratches is largely prevented, guiding elements are protected and the working life of seals is extended.

The function of the Guiding Tape is to guide the piston and rod of a hydraulic cylinder and to absorb the transverse forces which occur. At the same time, metallic contact between the sliding parts of the cylinder, e.g. piston and cylinder barrel or rod and cylinder head, must be prevented.

Non-metallic guide rings offer major benefits compared with the traditional metallic guides, for instance:

• cost efficient production;
• high load bearing capacity;
• eliminates local stress concentrations;
• wear-resistant, long service lives;
• favorable friction behavior;
• damping of mechanical vibrations;
• eliminates hydrodynamic pressure problems in the guide system;
• low service costs.

The rod sealing set consists of a PTFE Rod Sealing Ring and an O-Ring. They are combined as a single unit and are appropriate for rods and plungers in hydraulic cylinders.

These seals are particularly suitable for control cylinders, servo-assisted equipment, machine tools and quick acting cylinders. The sealing set is also suitable for applications in the automotive (e.g. shock absorbers) and process industries. An optimal sealing performance will be obtained if the rod sealing set is used in tandem with a double-wiper.

The piston sealing set consists of a PTFE Piston Sealing Ring and an O-Ring. They are combined as a single unit and are appropriate for single-acting pistons in hydraulic cylinders.

These seals are particularly suitable for control cylinders, in servo controlled systems, machine tools and in construction machinery. An optimal sealing performance will be obtained if the piston sealing set is used in tandem.

The Synerings® system is an advanced sealing concept designed to meet extreme demands regarding temperature, medium, etc. which cannot be covered by conventional sealing compounds (like elastomers, PUR, fabric materials, etc.). PTFE is hardly elastic. Therefore, PTFE sealing elements have to be combined with an elastic component, usually an O-Ring. Synerings® consist of a PTFE part, made of a specially modified compound, and an energizing spring (standard: stainless steel). So, the outstanding thermal and chemical properties of PTFE can be used to full advantage. These rings can be used for static applications as well as for reciprocating, rotating and helical movements.

Custom Machined PTFE Seals are manufactured in accordance with customers' specific requirements. All we need is a drawing or a sample piece and we can produce special gaskets in a wide range of different materials and shapes.