PA6 and PA66 are very similar materials, also when reinforced. Let’s handle PA6+GF first and then see the difference to PA66.


Why choose?

  • Commonly used, relatively inexpensive material, easy to find references.
  • Good choice if your product is exposed to elevated temperatures, rattling, oil, and dirty hands.
  • Nice surface finish (on other than polished surfaces).

Why not choose it?

  • PA6 absorbs moisture which might decrease its strength and modulus of elasticity almost by half.

Typical applications:

  • Different types of levers that require high strength and stiffness
  • Boat cleats
  • Garden tool handles


Why choose (over PA6+GF)?

  • PA66 offers slightly better thermal resistance than PA6.
  • PA66 absorbs less moisture than PA6.

Why not choose?

  • Slightly higher price. If PA6+GF fulfills your requirements it does not make sense to pay more.
  • Moisture absorption problem is not fully eliminated by choosing PA66 instead of PA6. You might consider using PBT+GF instead.

Typical applications:

  • Spatulas and other kitchen utilities
  • Bodies of electric tools
  • Biking gear
  • Automobile parts


Do you have something to add? Please comment below:

All information on is based on the best knowledge and understanding of experienced plastic product designers. Nevertheless, we may be wrong. Do not use this website as your primary or only source of information. Always check and test in practice. Kindly contribute, if you know better. We do not take any responsibility, financial or ethical, for the outcome of your product.