Nylon 6

Nylon 6 is a tough, abrasion-resistant material. It has improved surface appearance and processability compared to nylon 6/6. It also can be molded about 80 degrees F (27 degrees C) lower with less mold shrinkage because it is slightly less crystalline. Adversely, nylon 6 has a lower modulus and absorbs moisture more rapidly than nylon 6/6. Moisture acts as a plasticizer, reducing tensile strength and stiffness and increasing elongation. But, while absorbed moisture reduces many properties, nylon owes part of its toughness to the plasticizing effect of moisture. As moisture content rises, significant increases occur in impact strength and general energy absorbing characteristics. Properly recognized and accounted for, the effect of moisture on the processing and properties of nylon need not be of great concern.

https://www.rtpcompany.com/products/product-guide/nylon-6-pa-polyamide-6/

This material could be useful to me for making the sole of a shoe because of its advantages such as it being strong, it has a high impact absorption rate and the commercial availability. However, I want the sole of the shoe to be cushioned but this material is stiff which could be a problem.

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