Evolution of Seal Materials
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. Let’s see how these materials stack up.
Non-stick coatings are all around you, helping you do many of day-to-day things we all take for granted.
In this article we’ll take a look at how your daily life could be very different if non-stick coatings had never been discovered by Roy J. Plunkett in 1938.
The base material was made via fiberglass impregnation in PTFE and refined, coating with silicone adhesive and with excellent heat resistant and mechanical strength.
Good release and smooth
Good performance of high temperature keeping, stable size.
Small friction coefficient, good insulation.
Good corrosion resistance.
Where High-Speed Seals Are Found
High speed rotary shaft seals are found in many applications. Examples would include cryogenic deflashing equipment, vacuum pumps, torpedo shaft seals, gas turbine engine starters, and submersible dredge pumps. AC/DC motors often require high speed shaft seals, and can be found in items like CNC tool spindles and dental or surgical instruments.
The impressive growth of the medical device, biomedical and healthcare industries over the past 15 years continues unabated even as materials such as fluoropolymers are meeting the increasingly challenging demand for new products and procedures.