Although Polyamide 6 (Nylon 6) and Polyamide 66 (Nylon 66) sound very similar, in the world of plastics processing and everyday products, they have quite different "personalities" and "strengths." You can think of them as brothers: the older brother 66 is more stable and heat-resistant, while the younger brother 6 is more flexible and easier to process. ▸ Resistance to Heat This is the most obvious difference between the two. Polyamide 66 : It has better heat resistance. If a part needs to work in a relatively hot environment for a long time (such as parts near a car engine), 66 is usually chosen. It doesn't soften easily when heated and maintains its shape. P...
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