These polyamides, commonly referred to as Nylons, are distinguished by different types. The most common engineering nylons are PA6 and PA66. Ertalon and Nylatron stock shapes are produced by either Extrusion or Casting. The process is in part a determinant of the character of the end product. Modifiers are added to enhance desirable characteristics. Advantages: Nylon is a tough, durable, general purpose engineering material with special grades for specialty applications. Typical application conditions would be medium speed and temperature in a rugged, abrasive, impact and high load environment.