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PA66 has a higher melting point among polyamide materials. It is a semi-crystalline-crystalline material. PA66 can also maintain strong strength and rigidity at higher temperatures. PA66 is still hygroscopic after molding, and its degree mainly depends on the composition of the material, wall thickness and environmental conditions.

The effect of hygroscopicity on geometric stability must be considered during product design. In order to improve the mechanical properties of PA66, various modifiers are often added. Glass is the most common additive, and sometimes synthetic rubber, such as EPDM and SBR, is added to improve impact resistance. PA66 is less viscous, so it flows well (but not as well as PA6).

This property can be used to process very thin components. Its viscosity is sensitive to temperature changes. The shrinkage of PA66 is between 1% and 2%, adding glass fiber additives can reduce the shrinkage to 0.2% to 1%. The difference in shrinkage in the flow direction and the direction perpendicular to the flow direction is larger. PA66 is resistant to many solvents, but less resistant to acids and some other chlorinating agents.

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