Nylon 66 is a type of synthetic polymer known for its strength and durability. It is made from two monomers: hexamethylenediamine and adipic acid. This combination gives it excellent resistance to wear and tear, making it suitable for various applications, including textiles, automotive parts, and industrial components. The number "66" in its name refers to the six carbon atoms in each of the two monomers used in its production. Nylon 66 is often used in the manufacturing of clothing, car tires, and fishing lines due to its high melting point and ability to withstand harsh conditions.