24 сентября, 2015 
Pokraskin Polyamide Nylon was one of the earliest plastics and has been commercially available since the late 1930s.
The standard grades are PA6, PA66 and PA12 but there area also many speciality grades available including lubricated, plasticised, flame retardant and, perhaps most common of all, glass filled.
Polyamide is tough, inexpensive and has good resistance to heat and chemicals but polyamides can sometimes have poor dimensional stability due to water absorption. The main advantage of PA6 over PA66 is that it is easier to process and produces lower mould shrinkage but PA66 has better low-temperature toughness and good fatigue resistance.
PA12 has lower water absorption and improved UV resistance but has a lower temperature resistance than the other polyamide grades.
Polyamides are used in a wide range of applications including under-bonnet applications such as the air intake manifold, and the air and cooling system peripherals. It is also used to manufacture electrical components such as switches, connectors and contactors. Applications are as diverse as castor wheels for furniture to aerosol valves.
Polyamides can usually be bonded quite easily (Table 2.4) but long-term durability can be an issue in some applications due to water absorption. The alkoxy silicone product shows good strength and durability on polyamide and the result of 1.7 N/mm2 is a measure of the cohesive strength of the silicone rather than the adhesive strength to the base material.
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