PA6 and PA66 are very similar materials, also when reinforced. Let’s handle PA6+GF first and then see the difference to PA66.
- 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.
- 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.
- Spatulas and other kitchen utilities
- Bodies of electric tools
- Biking gear
- Automobile parts