PTFE rotary shaft seals are an excellent solution to high speed applications with surface speeds up to 30 m/s. In this article, we are going to look at four reasons behind that continued popularity.
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There are many applications that require high-pressure seals, such as down-hole safety valves, water jet intensifiers, and oil and gas valves. PEEK, short for polyetheretherketone, is a high performance engineering polymer thats a common choice for high pressure seals. Lets see why
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FLUID MEDIA AND PTFE SEALS:
You may not be aware of the fact that the fluid media has a significant effect on seal wear. In this article, we are going to explore exactly how fluid media can affect the performance of your PTFE spring-energized seal.
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When designing a component that includes a spring-energized PTFE seal, its not enough just to specify all the seal parameters; another key part of the design is the surface finish of the mating surface. In this article, we are going to review what surface finish is, discuss the effects of surface finish on seal life, and then go over recommended surface finishes for spring-energized PTFE seals.
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Elastomeric seals performed well for many years, but as the applications and environments became more demanding, elastomers had a hard time keeping up. If the application pressure is above 30 psi or the operating temperature goes above 275°F, elastomers simply dont perform as well as, say, PTFE. (polytetrafluoroethylene). In this article, we are going to look at 3 areas where PTFE rotary shaft seals outperform rubber shaft seals.
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In this article, we are going to discuss what the best choices are for high-volume low-cost plastic 
bushings. When an engineer is designing a part to be manufactured, there are two approaches:
Lets try answering the question for todays article by starting with manufacturing processes for plastics.
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In this article, we are going to review some of the basic principles behind the PV value, and take a look at some PV values for commonly used bearing materials.
The amount of wear a bearing is going to experience is related to the bearing pressure and the running velocity. The more pressure applied to the bearing, the faster it will wear; similarly, the faster the bearing surface speed, the more wear will occur. Did you ever wonder why? One clue lies in the amount of heat that is generated as a result of interaction between the bearing and the shaft. The more heat that is generated, the faster the bearing will wear. One value that represents this relationship between heat generated and the resulting wear is the PV value. You will see this value used as a key part of the material selection process when specifying a bearing.
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The evolution of seal materials evolved as seals faced more rugged demands. Early needs could be met using packed hemp or leather, but as the demands became more and more rigorous new materials were sought. This led to the introduction of natural rubber seals, which evolved into synthetic elastomers, and finally engineering polymers like PTFE (Polytetrafluoroethylene).
Four of the most common modern material options for rotary shaft seal lips are nitrile rubber, polyacrylate, FKM, and PTFE. Of these materials, three are elastomers nitrile rubber, polyacrylate rubber and FKM and only one is polymer PTFE. Lets see how these materials stack up.
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Polymer bellows are found in quite a few industries, including petrochemical, medical, pharmaceutical, chemical, and the food industry. Because of its chemical inertness, low spring life, and long flex life, PTFE is often the material of choice for polymer bellows. However, it isn’t the only option. In this article, we are going to compare PTFE and TFM.
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Polymer bushings have found widespread acceptance because they are typically low friction, light weight, relatively inexpensive, have an extended service life, and can be self-lubricating. Most polymer bearings and bushings are made from a form of PEEK, PTFE, Nylon, or UHMW PE. PEEK is becoming increasingly popular because it offers a good balance of chemical, heat, and wear resistance; and is, versatile when it comes to manufacturing.
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