The primary difference is the length of the polymer chain. Nylon 12 has a longer hydrocarbon section, which results in significantly lower moisture absorption (approx. 0.1% vs 1.5% for Nylon 6). This makes Nylon 12 far more dimensionally stable and resistant to impact, though it has a lower melting point and lower tensile strength than its counterparts.

Yes, Nylon 12 is highly suitable for outdoor environments. It has excellent resistance to UV radiation and environmental stress cracking and, because it does not absorb much water, it does not become brittle in dry conditions or lose its shape in humid climates (unlike other polyamides).

Standard industrial Nylon 12 is not automatically food-safe although many specific grades are manufactured to meet FDA and EU food contact regulations.
Similarly, certain grades are certified for medical use (ISO 10993) for short-term contact, such as in catheters and surgical guides.
Always check the specific material data sheet for certifications.

Yes, Nylon 12 is a thermoplastic, meaning it can be melted and reformed. In industrial 3D printing, unsintered powder is often reclaimed and mixed with fresh powder for subsequent builds. In injection moulding, it is classed under Recycle Code 7 (Other).

Yes. Although Nylon 12 has the lowest water absorption of the nylons, it is still slightly hygroscopic. Any moisture present during injection moulding or extrusion can cause silvering (splay marks) on the surface or internal structural voids. It should typically be dried to a moisture content of <0.1% before processing.

Nylon 12 is remarkably resistant to oils, greases, aliphatic hydrocarbons (fuels), and alkalis, and is the preferred material for automotive fuel lines for this reason. However, it is susceptible to strong mineral acids (like sulphuric or hydrochloric acid) and certain chlorinated solvents.

Yes. Because it is naturally a translucent off-white or "natural" colour, Nylon 12 takes dyes very well.
It can also be painted, provided the surface is correctly cleaned and, in some cases, primed to ensure adhesion.

Nylon 12 is exceptionally well-suited for high-pressure applications, such as hydraulic lines and pneumatic hoses. It possesses a high burst pressure rating and excellent fatigue resistance, allowing it to withstand repeated pressure cycles without deformation. Its low permeability also ensures that gases or fluids under pressure do not diffuse through the walls of the tubing, maintaining system integrity over long periods.

While traditionally petroleum-derived, Nylon 12 is increasingly available in "green" or mass-balanced grades. Its sustainability profile is bolstered by its extreme durability and resistance to environmental degradation, which extends the service life of components compared to less robust materials.