In the automotive industry, it is used because it is cheaper and lighter than metal. In machines, it is used over other materials due to its high flexibility and durability. 

Nylon 6,6, is a more crystalline version of nylon 6. It is also referred to as polyamide 66 or PA 66. It has improved mechanical properties due to its more ordered molecular structure. Nylon 66 for machining has improved temperature resistance and lower rates of water absorption when compared to standard nylon 6.

Pa12 gf20 is a type of engineering plastic that consists of polyamide 12 (pa12) compounds reinforced with 20% glass fibers. It is a high-performance material that has many advantages over pure nylon 12, such as higher strength, stiffness, thermal resistance, chemical resistance, and electrical properties. Pa12 gf20 is widely used for various applications in different industries, such as automotive, aerospace, medical, electrical, and industrial.