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Back-Up Rings | Spiral Back-Up Ring SPRSpiral Back-Up Ring SPRSpiral Back-Up Ring SPRMaterialMaterialCodeUnfilled PTFE PTFE00/F52800 or PTFE 177509Operating conditionsMediaTemperatureFig. 1Spiral Back-Up Ring SPRAll fluids used in hydraulics* according to the O-<strong>ring</strong> material used–70 … +260 °C*(only valid for PTFE component)Product descriptionSpiral-shaped split bea<strong>ring</strong> componentwith rectangular cross section.Product advantagesAdvantage compared to conventionalback-up <strong>ring</strong>s:Even in cases where considerable temperaturefluctuations occur, i.e. if thereis post-shrinkage of the back-up <strong>ring</strong>, atleast one turn of the spiral will be left tosupport the ISC O-Ring over the gap atany point around the circumference.Also suitable for non-standard diameters,as the <strong>ring</strong> can be shortened and thusadapted to fit.Fitting & installationThe surface finish requirementscorrespond to the values stipulated;→ Technical Manual.Gap width: when using PTFE spiral backup<strong>ring</strong>s, operating pressures ≤40 MPa(400 bar) or gap widths up to 0,3 mmcan be bridged.Special sizes or special materials areavailable on enquiry.ApplicationBea<strong>ring</strong> component to prevent gapextrusion of radial sealing ISC O-Rings.112© Freudenberg <strong>Simrit</strong> GmbH & Co. KG | O-Rings and Static Seals Catalog <strong>2007</strong>
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