Surface finishes for CNC machined nylon parts usually come in one of two forms:
Anodizing entails depositing an oxide layer onto a metal component in order to provide a shield against abrasion, wear, and corrosion. Additionally, this process can be used to alter the color of the surface. Anodized finishes often appear matte, but they can be polished to a high shine as well. Heat treatment is another technique used to enhance the strength and hardness of a material, such as nylon. Various heat treatments are available, including case hardening and flame hardening. Flame hardening requires that the nylon part be subjected to high temperatures using an open flame, such as an acetylene or oxyacetylene torch until it reaches a peak temperature range of approximately 300-500 degrees Celsius (572-932 degrees Fahrenheit). Case hardening entails exposing the nylon part to extreme temperatures in a closed furnace at about 1000 degrees Celsius (1832 degrees Fahrenheit) for around two hours, followed by quenching it in water or oil within 2 minutes of removing it from the heat.