Polyamides are the most common class of structural plastics. They are characterized by high heat and chemical resistance, have a high level of strength properties, have good antifriction properties, etc.

Modern production requires the use of polymers with improved performance characteristics. Mass use of PA is conditioned by a valuable complex of operational properties - high strength parameters (high tensile strength), high heat resistance, remarkable antifriction properties, excellent wear resistance, and also possibility of modification in a wide range. At the same time the use of polyamides in a number of cases, is limited because of insufficient resistance to shock loads.

Increase of resistance to impact is provided by the introduction of special materials into the composition - impact strength modifiers. Though bending and tensile strength is slightly reduced due to the modification, but their values remain at the level of values, typical for structural thermoplastics.