![]() Once the material liquefies, it is forced to the outer wall of the tool by centrifugal force, and builds up to the desired wall thickness. An appropriate amount of polymer is then added into the heated tool while it spins around its roll-axis. ![]() Outer diameters of the final product are limited by the tool that is used. Spin Molding is an interesting method to produce rather large, yet thin walled tubes and rings from high performance polymers such as PEEK. With a wide range of tube sizes in stock, in addition to others being available on a custom order basis, Ensinger is a strong leader in the PEEK tube industry. Lot sizes range from just one single piece for prototyping projects, up to industrial size lots. Our PEEK tubes and PEEK rings are available with wall thicknesses betweenĥ to 180mm (.2 to 7 inches) and outer diameters of up to 2200 mm (86 inches) and beyond. With almost 4000 different combinations of modification, production method and dimension, TECAPEEK offers the best diversity for industrial demand. Moreover, we can customize the material blend for tubes and rings by adding suitable fillers and additives or by adjusting the OD and wall thicknesses to fit most oil & gas application needs. All processes offer a wide range of sizes that can be tailored to the customer’s needs. Conversely, spin molding can provide tubes with thinner walls, in addition to offering the flexibility of billets that will perform in high temperature sealing applications. Compression molding allows us to offer sizes with thicker cross sections and wall thicknesses. In our production facilities all over the world, we produce PEEK tubes and rings through extrusion, compression molding, rotational molding (often referred to as spin cast or spin molding), and injection molding. Ensinger specializes in various processing methods to achieve the capability of producing PEEK tubes and rings for a wide range of dimensions. Required dimensions are as much of a driver as the application itself. PEEK is often the choice of material due to its temperature, chemical and creep resistance combined with its thermal stability and compressive strength. When it comes to backup ring materials, PEEK is can handle the highest pressures and fairly high temperatures.Tubes made from high performance polymer PEEK find their way into many different industries and applications, especially in the oil and gas, or semiconductor industry. Nylon can handle medium to high pressure applications but is limited by operating temperature and water absorption. When it comes to backup rings, PTFE works well for low to medium pressure applications but can also handle high temperatures. ![]() PTFE is very chemically resistant and has extremely low friction. The maximum operating temperature for PTFE is around 575☏, which makes it ideal for low pressure, high temperature applications. ![]() Virgin PTFE, therefore, is limited to low and medium pressure applications while filled PTFE works for many medium to high pressure applications. Nylon works well for high pressure applications but is quite limited with regard to temperature. Nylon 6,6 filled with Molybdenum Disulfide (MoS2) to reduce friction is commonly used for backup rings. One of the drawbacks of Nylon 6,6 is its water absorption, which can range from 0.5% to 1.4% per 24 hours.įilled PTFE (glass filled, carbon filled, graphite filled, bronze filled) works with pressures up to 5,800 psi, however virgin PTFE is limited to about 3,600 psi. Nylon 6,6 works well at pressures below 10,000 psi and a maximum temperature of 186☏. PEEK is quite compatible with a variety of chemicals, including cleaning compounds, and has low friction. PEEK is also available filled for addition strength and hardness. This makes PEEK ideal for high pressure and high temperature applications. ![]() PEEK can be used at pressures up to 20,000 psi and and a maximum temperature of 500☏. They work well in situations where there is a large extrusion gap, high temperatures, or high pressures. Purpose of Backup RingsĪ properly designed backup ring placed between the o-ring and the clearance gap can prevent the o-ring seal from extruding into the gap while providing both support and protection to the o-ring. In this blog post, we will review the purpose and applications of backup rings, then discuss the ranges of pressure and temperature that PEEK, Nylon, and PTFE are suited for. There are several different materials used to make backup rings, including both polymers and elastomers. The most common polymers for backup rings are PEEK, Nylon, and PTFE. Deciding which material to use is typically based on pressure and temperature requirements. Backup rings, also known as anti-extrusion rings of BURs, do exactly what their name implies: they act as back up support to sealing assemblies. ![]()
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