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Polymax Blog - O-rings
  • Buyers Guide to Oil Seals, Lip Seals and Rotary Shaft Seals

    Oil Seals and Rotary Seals at Polymax

    We now sell over 6,300 oil seals on our website! Lip seals or rotary shaft seals are vital components for all types of engineering machinery. As a result, we've created a guide our guide to help you choose the correct seal for your application, you can then continue to our new Oil Seal section to make your purchase.

    Oil Seal Cross Reference Guide
    What are they? Oil Seals are used in driveshafts, crankshafts and hydraulic cylinders where a rotating shaft is lubricated by oil or grease. They are metal caps covered in rubber with a garter spring supporting the inner lip.
    Continue reading
  • Sponge O-rings | Cord Bonding at Polymax

    Sponge O-rings PolymaxDue to an increase in the demand for sponge O-rings we've developed a way to effectively vulcanise and bond extruded cord. This is great news for anyone who has been using our solid or sponge cords to create custom sized O-rings, as our heat and pressure vulcanisation process creates a far superior join then just using adhesive.

    We can join any of our extruded cords larger then 1.5mm diameter and 18.5mm inner diameter. Continue reading

  • Aflas® vs Viton® - What is the difference?

    Aflas vs VitonThis article will outline the main differences between Aflas® vs Viton® O-rings. Customers typically request FKM or FFKM for harsher working conditions. However, choosing a lesser known compound can save a lot of money in the long term. Aflas® is a member of the fluoroelastomer family based on an alternating copolymer of TFE and propylene (FEPM). Introduced by the Asahi Glass Ltd under the name AFLAS®, just 5 years after the invention of FKM, in 1975. The unique polymer structure of Aflas® offers properties with a continuous working temperature of 200°C and a maximum peak exposure temperature of 205°C, with outstanding chemical resistance.  Continue reading

  • MQ, VMQ, PMQ and FVMQ Silicone O-rings

    Difference between MQ, VMQ, PMQ and FVMQ

    Silicone rubber is known by several terms which can lead to misinterpretation. Firstly, the ISO (International Organisation for Standardisation) uses the abbreviations of MQ, VMQ, PMQ and FVMQ. Conversely, ASTM (American Society of Testing and Materials) uses its own designations of GE, FC, FE and FK. For this reason, we will explain the structural differences indicated by these terms and the unique properties they provide.

    Silicone is the preferred material for use with food, medical and aerospace industries due to its great flexibility, thermal stability, low toxicity, resistance to oxygen, ozone and UV, as well resistance to microbiological growth. It offers the widest temperature range of all O-ring materials from -55°C to 200°C as standard, with specially compounded versions ranging from -115°C to +232°C.


    MQ, VMQ, PMQ and FVMQ Silicone O-rings

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  • What is the Best High Temperature O-Ring?

    Heat is one of the most destructive forces in compound deterioration. To decide which is the best high temperature O-ring, it is important to consider other factors such as the required chemical resistance. For high temperature applications (over 150°C) you may wish to consider using one of the following materials; FKM, FFKM, ACM, HNBR, VMQ, FVMQ, AFLAS, PTFE and FEP.

    The Best High Temperature O-ring Chart Continue reading
  • Nitrile vs Viton® - What is the Difference?

    This article will explain the main differences between Nitrile vs Viton®. Two of the most commonly approved elastomers, Nitrile (popularly referred to as NBR or Buna-N) and Viton® (Fluorocarbon rubber). Both materials are a great choice for general industrial use, they offer excellent compression set resistance and have a versatile set of properties list of applications and properties.

    Nitrile vs Viton® What is the Difference? Nitrile vs Viton®

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