Image showing Polyamide gearing replacing metal gear

Polyamides (PA) are semi-crystalline polymers. They have very good mechanical properties, are particularly tough and have excellent sliding and wear characteristics. Properties vary from the hard and tough PA 6.6 to the soft and flexible PA 12. Depending on the type, polyamides absorb different amounts of moisture, which also affect the mechanical characteristics as well as the dimensional accuracy.

4MID® is the registered trade mark for Polyamide (PA) compounds produced by 4PLAS, we offer a wide range of Polyamide compounds and blends that are based on the following PA resins:

  • 4MID® A (PA 6.6)
  • 4MID® B (PA 6)
  • 4MID® AB (PA 6.6/6)
  • 4MID® U (PA 11 & PA12)
  • 4TECH® (Polyamide)

Available in prime, industrial, recycled & cross blends 4MID® offers the ideal balance between cost & performance. Long fibre reinforced materials in standard grades and custom compounds, ensure that we can truly offer a complete range.


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4MID® compounds offer the following key properties:

  • Excellent stiffness
  • High mechanical strength
  • Very good thermal stability
  • Excellent flammability resistance
  • Good electrical properties
  • High wear resistance and low friction
  • Very good chemical resistance
  • Good flow and processing properties


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With the addition of a wide range of modifiers, stabilisers, speciality additives and customised colours, 4MID® can be compounded as:

For individual grades or to search using a wide range of criteria please use our interactive material selector.

Our standard range is comprehensive, however should you not find what you are looking for within the data available on this website, we offer Custom Compounds to suit the requirements of specific applications.

If you would like advice on selecting suitable materials, or you cannot find what you are looking for, please contact us and one of our team will be pleased to assist you.

4Plas Account

An account provides you with full online access to data and documentation for all 4PLAS materials, the 4PLAS brochure, plus the facility to print and download any document.