Polyamides (PA) are assigned to the group of thermoplastics and, as an engineering plastic, have a high strength so that a very wide range of applications can be covered.
Polyamides are produced both in casting and extrusion processes. Production in the casting process gives advantages in the range of dimensions, in the mechanical properties, and also in the stress properties of the material.
The standard version of PA 6 is very impact resistant and has a high buffering capacity and a high wear resistance. Preference should be given to PA6.6 for higher thermal demands on the component because the melting point is higher and, as a consequence, better thermostability is given.
Also, there is the possibility to improve systematically individual properties by the addition of additives.
PA6 MOS² receives, by the addition of molybdenum sulphide, an overall better and even wear resistance and improved sliding properties.
PA6 + oil are used specifically for components with a high wear resistance requirement since the wear resistance is much higher than in the standard version. Furthermore, this material exhibits excellent sliding properties thanks to the self-lubricating properties of the components through the injected additive.
The raw material gets glass fibres added in different quantities to give the polyamide a higher pressure resistance and, at the same time, to positively change the high thermostability of the material. For example, PA6 GF 30 is used under high mechanical stresses, e.g. as gear rack or cableway spool.
Depending on the version, polyamides absorb, among other things, certain amounts of humidity from the air. This will result in, in addition to increased material toughness, also volume changes and thus dimensional changes. The PA 12 version has the lowest humidity absorption and thus the best dimensional stability.
Overall, polyamides find their use as gears, plain bearings or chain guides in mechanical engineering, but also in the area of automotive engineering and electrical engineering or in the form of rollers in the heavy-duty arena. Further applications are found in vehicle and agricultural engineering, in the construction industry in the form of lifting equipment and rope winches, as well as in the food and beverage industry as star configuration conveyors or screw conveyors.