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We’ve compiled a list of the most frequently asked engineering plastics questions to help you find answers fast. Not seeing the information you need? Connect with the Teknor Apex team.
Melting temperature and re-crystallization rate are the two key differences between PA 66 and PA 6. PA 66 has a melting temperature of 262℃ compared to 220℃ for PA 6. As for re-crystallization, PA 66 “freezes” much faster than PA 6, making PA 66 ideal for fast cycle times in injection molding.
PA 66 and PA 6 behave similarly in terms of chemical resistance, mechanical properties, and moisture uptake.
Most plastics suppliers, especially the large resin producers, push a standard list of materials and offer minimal support to molders who experience processing or performance issues with these standard grades. Often part, tooling, processing, and performance issues can be addressed with an optimized material solution, which can result in significant cost savings by improving manufacturing efficiencies or avoiding expensive tooling or equipment modifications.
PA 6 is the most common alternative to PA 66, particularly when the application has a low end-use temperature. Other common alternatives include polyesters such as PBT and PET, as well as polypropylene (PP) in certain applications.
All polyamides (nylons) absorb moisture, but the amount and rate of moisture absorption varies by type. Moisture affects polyamides in two ways:
A term coined in the 1970s, “super tough nylon” refers to Polyamide 66 (PA 66)-based compounds modified with rubbers and elastomers for increased impact resistance, toughness, and ductility. Additional benefits include lower specific gravity, reduced moisture absorption, and higher melt strength versus standard PA 66 resin.
Like most engineering thermoplastics, polyamides (nylons) are not inherently flame retardant. However, they can be optimized and formulated to meet many stringent flammability requirements.
Many polyamides (nylons) inherently possess very good hydrolysis resistance. In other cases, hydrolysis resistance can be much improved by specialty formulations; either by incorporating additives or by blending with polymers that are not sensitive to moisture.