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Polymax Blog - O-rings
  • 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

    Continue reading
  • 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
  • Product Focus - O-Rings - Rotary Shaft Seals


    O-rings Polymax stocks over 7000 different combinations of o-rings. We can also produce almost any o-ring to order. Whether you require a cross section of less than 1mm or up to 40mm; an inside diameter of less than 1mm or in excess of 10 metres, Polymax can help.

    We can supply o-rings in materials capable of withstanding most chemicals and aggressive media, of which some are capable of withstanding temperatures as low as -60°C and others that can be used at 325°C. 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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