PTFE SOLID?backup ring Product Description ? Back-up Rings have no intended sealing function. They are protective and?supporting elements made from extrusion-resistant?materials which generally have a rectangular cross?section. They are installed in a groove together with an?elastomeric sealing element preferably with a?corresponding O-Ring in static applications.Due to the tight fit of the Back-up Ring in the housing, they?prevent extrusion of the pressurised elastomeric sealing?element into the sealing gap. Advantages?

-?Use of O-Rings in high pressure applications?

-?Use of O-Ring materials with a low hardness?

-?Compensation of radial sealing gaps??

-?Use for internal and external sealing applications?

-?Reciprocating and rotating movements possible??

-?Compensation for large temperature fluctuations?

-?Static and dynamic applications??

? External sealing (Bore)?? Back-up Ring types, uncut?? ?Type BM ?? - Rectangular cross section?? - Material:?PTFE??? - Static and dynamic use?? - Reciprocating and rotating movements possible? Type BCM ? - Concave cross section?? - Materials: NBR, FKM??? - The large contact surface protects the O-Ring against??? deformation in case of high pulsating pressure??? - Dimensional stability of the O-Ring improves the?sealing force and increases the service life??? - Preferably for static use?? - Reciprocating movements possible?? ? Back-up Ring types, cut??? Type BG ?? - Rectangular cross section?? - Material PTFE?? - Cut angle of 30° or 45°?or 20° - Static and dynamic use?? - Reciprocating and rotating movements possible?? - Preferred for installations in a closed groove where?uncut Back-up Rings are not suitable Type BCC ? - Concave cross-section?? - Material: PTFE?? - Cut angle of 30° or 45°?? - The large contact surface protects the O-Ring against??? deformation in case of high pulsating pressure - Dimensional stability of the O-Ring improves the?sealing force and increases the service life - Static and dynamic use??? - Reciprocating movements possible??? - Preferred for installations in a closed groove where?uncut Back-up Rings are not suitable ? Back-up Ring types, spiral??? Type SP ? - Rectangular cross section?? - Material: PTFE?? - Cut angle of 30° or 45°?? - Consists as standard two spiral windings which are cut?at the ends at an angle - Static and dynamic use?? - For reciprocating movements only? - Preferred for installations in a closed groove where?uncut Back-up Ring are not suitable? - Compensation of large temperature changes and?tolerances without difficulties by a?screw-like?elongation and contraction. Easy Installation in closed?grooves for external sealing applications - The dimensions are different compared to standard?Back-up Rings ? Internal sealing (Rod)?? ? Back-up Ring types, uncut?? Type BM ? - Rectangular cross section?? - Material: PTFE? - Static and dynamic use?? - Reciprocating and rotating movements possible?? ?Type BCM ? - Concave cross-section?? - Materials: PTFE, NBR, FKM?? - The large contact surface protects the O-Ring against?deformation in case of high pulsating pressure - Dimensional stability of the O-Ring improves the?sealing force and increases the service life - Static and dynamic use??? - Reciprocating movements possible?? ? Back-up Ring types, cut?? Type BG??? - Rectangular cross section?? - Material: PTFE? - Cut angle of 30° or 45°?? - Static and dynamic use?? - Reciprocating and rotating movement possible?? - Preferred for installations in closed grooves where?uncut Back-up Ring are not suitable Type BCC?? - Concave cross-section? - Material: PTFE?? - Cut angle of 30° or 45°?? - The large contact surface protects the O-Ring against?deformation in case of high pulsating pressure - Dimensional stability of the O-Ring improves the?sealing force and increases the service life - Static and dynamic use?? - Reciprocating movements possible? - Preferred for installations in a closed groove where?uncut Back-up Rings are not suitable ? Back-up Ring type, spiral?? Type SP ? - Rectangular cross section?? - Material: PTFE?? - Cut angle of 30° or 45°?? - Consists as standard two spiral windings which are cut?at the ends at an angle - Static and dynamic use??? - For reciprocating movements only? - Preferred for installations in a closed groove where? uncut Back-up Ring are not suitable - Compensation of large temperature changes and?tolerances without difficulties by a screw-like?elongation and contraction Figure ?Back-up Ring types?? ? ? External sealing (Bore)? ?Type BM ?? - Rectangular, uncut, PTFE??? - Standard: AS568 MS27595,JIS B2407 ?Type BCM ? - Concave, uncut, PTFE+NBR + FKM?? ?Type BG ? - Rectangular, cut, PTFE? - Standard:AS568 MS28774,MS28773,JIS B2407,AS8791/1,AS4716,AS5860 ?Type BCC ? - Concave, cut, PTFE?? - Standard:AS568 ?Type?SP ? - Spiral, PTFE?? -Standard: AS568 TF171,MS28782,MS28783,JIS B2407 ? Internal sealing (Rod)?? H Type BM ? - Rectangular, uncut, PTFE??? - Standard: AS568 MS27595,JIS B2407? H Type BCM ? - Concave, uncut, NBR + FKM + PTFE? - Standard:AS568 H Type BG?? - Rectangular, cut, PTFE? - Standard:AS568 MS28774,MS28773,JIS B2407,AS8791/1,AS4716,AS5860 ? H Type BCC ? - Concave, cut, PTFE? - Standard:AS568? H Type SP?? - Spiral, PTFE -Standard: AS568 TF171,MS28782,MS28783,JIS B2407 ? Materials?? Back-up Rings are as standard manufactured from virgin?PTFE. In view of the unfavourable cold flow behaviour of?virgin PTFE, these Back-up Rings are used only for low to?medium loads. For higher load requirements, filled PTFE?materials (with glassfibre, bronze, carbon, etc.) have to?be used. For sealing against high pressures, Back-up?Rings made from specially modified thermoplastic?materials are used.For the series production of larger quantities, injection?moulded Back-up Rings can be manufactured, e.g. NBR?90 Shore A, FKM90 Shore A, or thermoplastic elastomers?(TPE) on request.? ? Applications? Application examples?? - Injection moulding machines?? - Machine tools?? - Presses?? - Excavators?? - Agricultural machines?? - Valves for hydraulic circuits? ? Technical data?? Operating pressure?? Static applications: Up to approx. 250 MPa?depending on the Back-up Ring??material and sealing gap Dynamic applications: Reciprocating?up to approx. 40 MPa???????????????? Oscillating/slowly rotating up to?approx. 15 MPa?? Speed: Reciprocating or rotating?up to approx. 2 m/s?depending on the material???????????Operating temperature: - 200 °C to + 260 °C??depending on the material??