What environmental factor drastically affects the tensile strength of Nylon filaments?

The environmental factor that drastically affects the tensile strength of Nylon filaments is humidity (moisture content). Nylon is a hygroscopic material, meaning it readily absorbs moisture from the surrounding air. Increased moisture content significantly reduces Nylon's tensile strength and stiffness, making it more flexible and prone to deformation under load. The absorbed moisture acts as a plasticizer, increasing the mobility of the polymer chains and reducing the intermolecular forces that contribute to its strength. For example, a Nylon filament stored in a humid environment can absorb several percent of its weight in water, leading to a substantial decrease in its tensile strength compared to a dry filament. Therefore, proper storage in a dry environment and the use of desiccants are essential for maintaining the mechanical properties of Nylon filaments and ensuring reliable 3D printing.