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PTFE Back-Up Rings
Specification Range
PTFE Back-up Rings
Backup rings are designed to prevent extrusion in rubber or polymer o-ring sealing systems. PTFE Back-up rings are the most common anti-extrusion devices used in dynamic and static sealing, designed to prevent the migration of sealing material into the extrusion gap under the system pressure.Our backup rings are made from several kind of materials, PTFE, TFM and PEEK and customized polymer materials. There are made of a broad range of compounds which are highly resistant to thermal or mechanical stress. Back-up rings are typically associated with the use of O-Rings. However, they are also utilized with different types of piston seals, T-seals, and infrequently U-Seals.
The back-up ring’s performance is largely influenced by the component from which it is built. Use a material that is both tough enough to withstand extrusion and elastic enough to have enough memory to make installation simple. For example, the back-up ring should expand during installation but then return to its previous size and form. HONGDA back-up rings help reduce costly downtime and ensure long-term functional
| Brand Name: | HIGHDOM |
| Model Number: | Back-up rings, TFM Seal, PTFE seal |
| Certification: | FDA, ROHS, REACH, ISO |
| Raw material brand | DAIKIN, 3M,DUPONT，Chinese brand PTFE |
| Minimum Order Quantity: | 100PCS |
| Operating temperature: | -180°C~+260°C |
| Supply Ability: | 50,000PCS/month |
PTFE Back-up rings are the most common anti-extrusion devices employed in dynamic and static sealing, Hongda offers a long list of seal products made of PTFE, TFM, Filled PTFE, PEEK, PCTFE, ETFE,PFA,UHMW, PA
Technical standard
| Mechanical seals often need to be used in chemical applications. PTFE will handle most chemical applications, chemical attack is no longer an issue. One the down side PTFE wedges can cause fretting of your sleeve or shaft if you have not hard surfaced your shaft or sleeve. The stationary element of your seal will require a PTFE gasket.Choice for O-Ring & Gasket Materials | |||
| Material Name | Compound % | Properties | Color |
| PTFE | / | Very low coefficient of friction and excellent chemical resistance. | White |
| Glass Filled PTFE | Up to 30% | Improved ware resistance, compression strength, creep resistance, chemical resistance. | White cream |
| Carbon Filled PTFE | Up to 35% | Improved electrical and termal conductivity, resistance to load, low coefficient of friction in dry, water, steam applications, chemical resistance. Superior ware resistance increase and low friction properties. | Black |
| Graphite Filled PTFE | Up to 15% | Improve wear resistance, decrease friction and increase sliding properties against soft metals- chemical inertness. Improve the temperature resistance in some way. | Black |
| Bronze Filled PTFE | Up to 40% | Improved compression strength, wear resistant, high thermal conductivity, resistance to abrasion. Reduced chemical resistance. | Dark Brown |
| Molybdenum disulphide(MoS2) Filled PTFE | up to 5% | Increased PTFE hardness and wear resistance. Increased sliding properties and decrease friction. | Blue azure |
| PEEK Filled PTFE | Up to 20% | Increased thermal resistance, sliding properties, surface hardness. Superior properties on dynamic applications. | Light Brown |
| PEEK | / | Excellent mechanical properties including strength, rigidity, impact resistance, low wear rate and low coefficient of friction, retained over a wide range of service temperatures | Light Brown |
| PEEK compound | / | Improves technical and chemical properties like deformation under load, wear resistance, thermal expansion and electrical conductivity. | / |
| PVDF | / | Resistant to UV radiation and offers high mechanical strength and welding properties. | Natural |
| PCTFE | / | Ideal sealing material for lower temperature and high pressure, good mechanical properties | White translucent |
| PFA | / | Excellent chemical and temperature resistance, electrical insulation and translucent. | Natural |