Many types of nylon are commercially available. The most popular type is nylon 6/6, followed by nylon 6, then nylon 6/12, nylon 11 and nylon 12. Nylon 6/6 offers an excellent balance of properties and is the strongest of the nylons.
Nylons absorb more moisture than most other polymers. Moisture acts as a plasticizer, reducing tensile strength and stiffness. While absorbed moisture may reduce some properties, significant increases in elongation, impact strength, and energy absorbing characteristics are noted with increasing moisture content. Properly recognized and accounted for, the effect of moisture on the processing and properties of nylon need not be of great concern.