Polyamide 66 (PA 66) - has good rigidity, hardness, abrasion resistance and thermal dimensional stability. With respect to these particular aspects, PA66 offers certain advantages compared to PA 6.
Compared to the cast types, PA 66 has higher moisture absorption. With regard to all other characteristics, PA 66 is comparable to the standard cast type PA 6 G, but more expensive.
- good mechanical strength
- high impact strength
- good damping characteristics
- good resistance to wear
Among commercially available polyamides, PA66 has one of the highest melting points. It is a semicrystalline-crystalline material. The grades have strength and stiffness which is retained at elevated temperatures.
It does absorb moisture after molding, but the retention is not as much as in the case of PA6. Moisture absorption depends on the composition of the material, wall thickness, and environmental conditions.
Dimensional stability and properties are all affected by the amount of moisture absorption which must be taken into account for product design.