![]() Our backup rings are made of pure PTFE, filled PTFE or peek, depending on the application. PEEK is a semi-crystalline, show high stiffness and hardness, has an unique high tensile strength and fatiue strength, Resistant to high-engery radiation, high abrasion and wear resistant, good electrical insulator even at high voltages, and is characterised mainly by its very good mechanical properties and exceptional dimensional stability even continous operation at high temperatures of up to 250☌. Because the backup rings fit closely with the housing, they prevent the pressurized elastic seal from squeezing into the sealing gap. ![]() In static applications, elastic seals are preferably equipped with corresponding O-rings. They are installed in grooves together with elastic seals. Peek backup rings are protective and supporting elements made of anti extrusion materials, usually with rectangular cross-section. and back up ring seal is typically used with O Rings to eliminate extrusion at high pressures. This could help you to reduce the cost.Back-up Ring/anti extrusion back up rings are a ring that holds an elastomeric seal to its outline shape and in its right place. For compression molding, the super large size and customized size are also available. Nevertheless, our company could provide you with a wide range of size extrusion PEEK natural tubes and compression molding PEEK or PEEK modified rings. The raw material, molding difficulty cause the high price. However for PEEK, even very slightly oversized, see 0.001, may cause the assemble problem.Īs we all know, PEEK is an advanced plastic. If the backup ring is slightly larger than the hardware, the soft material like PTFE may be able to deform to fit in the hardware, like squished into the place. What are the potential issues in using PEEK backup ringĪs mentioned before, PEEK has good mechanical strength, high modulus, and good dimensional stability. Meanwhile, PEEK does not need a very special machining process. However, compared to other plastic, PEEK always keeps dimensional stability due to its molecular structure and low water absorption. But unfortunately, after machining or other molding methods, due to the variation of stress and other factors, all the plastic may be deformed. When you design a backup ring, you want all the designed dimensions to keep in the tolerance. Great dimensional stability and easy to machine Only combining the right material and good design structure could achieve the best results. What needs illustration is that the backup ring design is also vital. A very typical example is the PEEK backup ring used in the oil downhole tool which the working temperature is up to 175℃ and the pressure is 140mpa at the same time. Plastic-backed absorbent toweling can be placed on the work surface but not. Because the glass fiber is reinforced, it performed better than PEEK natural under high temperature and high pressure working conditions.īesides the great mechanical strength, PEEK also has a very high long-term service temperature which is up to 260℃.Ĭombining the excellent mechanical capacity and high continuous operating temperature, the PEEK backup ring could keep the rubber O-ring functioning well under high temperature and high-pressure working conditions. Serodiagnostic studies in an immunocompetent individual. This material has an even higher modulus. These rings are interchange-able with MS27595, MS28774, MS28782 and MS28783 back-up rings used in MIL-G-5514 packing glands. The extra thickness provides more extrusion protec-tion for O-Rings. While in some certain extremely high temperature and high-pressure conditions, PEEK GF30 is a better choice. Heavy Duty Back-Up Rings Heavy Duty back-up rings are configured with a greater axial thickness (T) dimension. These values mean PEEK natural could be functioning normally under very high pressure and temperature. We can see in the table below that the modulus of PEEK natural is 4200mpa, tensile strength and flexural strength are all above 100mpa. What are the PEEK’s excellent properties?Ĭompared to other common plastics, PEEK has higher mechanical strength. And the commonly used materials are acetal, nylon, PEEK, and PTFE according to different applications, but among these plastics, PEEK and PTFE are most used. Also, the material chosen should be based on the working condition, pressure, temperature, and other factors. Generally, the material of backup rings usually uses polymer. What material can be used in this application Especially in some high-pressure working applications, such as coal mining or oil drilling, so the backup ring is essential. If the pressure acts on the O-ring sealing surface, it may cause O-ring deformation resulting in permanent seal failure. ![]() Actually what seals is the O-ring and the O-ring is usually made of rubber. Usually, the backup rings are just structural support that keeps the O-ring away from the extrusion gap in hardware. You can tell its function from the name: it back up the O-ring. Back up ring plays a very important role in the seals. ![]()
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