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Four Most Popular Rotary Shaft Seals Material Options and How They Compare

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).

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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.

 

Want more about PTFE? Check out these artiicles from the popular Advanced EMC Technologies blog:

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PTFE and Modified PTFE Bellows: What’s the Difference?

Polymer Bellows

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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Want more information on polymer bellows, check out these posts from the popular Engineer’s Blog from Advanced EMC Technologies:

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