Polyamide 6 versus polyamide 66

Polyamide is the most common engineering thermoplastic in use today. Annual consumption of polyamide for engineering plastic applications exceeds 2000 ktons. Polyamides cover a broader range of applications than any other engineering plastic. Nylon grades are suitable for all major processing techniques, such as injection moulding, blow moulding and extrusion.
The most important application areas are:
– automotive: air and fuel ducts, under the-bonnet covers, door handles and trunk grips, power train, blow moulding and interior applications.
-electrical/electronics: power distribution, industrial connectors, power tools and E&E components.
– other industries: railway systems, furniture, castor wheels, sports goods, consumer durables, building products and industrial goods.
Polyamide has an excellent combination of properties:
– high stiffness and strength at elevated temperatures
– toughness at low temperatures
– excellent heat ageing resistance
– good abrasion and wear resistance
– chemical resistance
– excellent surface appearance.
These properties can be enhanced by the use of glass fibre and beads, minerals, flame retardants, toughening agents and other additives.
In most applications polyamide 6 outperforms polyamide 66 at temperatures up to
185 °C, since PA6 yields in comparison to PA66:
– higher toughness levels at low temperatures but comparable stiffness levels at elevated temperatures up to 185 °C
– better heat ageing resistance
– easier processability(broader processing window, the use of lower processing temperatures can lead to shorter cycle times)
– higher weld strength after various welding processes;
– better surface appearance of reinforced grades;
– the possibility of halogen-free flame retardancy in reinforced PA6 grades.