SELECTED PLASTICS WEAR RESISTANCE

Plastics are macromolecular materials without which we cannot imagine any branch of human activity. Plastics have unique properties, often very different from metals. At the choice of concrete plastic for the concrete application it is necessary to evaluate its mechanical, physical, chemical and technological properties. In recent years producers offer also plastics for production of parts exposed to different types of wear. In the contribution the results of wear resistance studying of 10 types of plastics of one producer are published and compared with the test results of four different Fe alloys. The laboratory tests were carried out using the pin-on-disk machine with abrasive cloth, when the abrasive clothes of three different grits were used. The wear intensity was assessed by the volume, weight and length losses of the tested samples. The technical-economical evaluation was a part of the carried out tests. It was univocally proved that at intensive abrasive wear using the abrasive cloth the best results are shown by the High-Speed Steel HSS Poldi Radeco (19 810 according to CSN 41 9810), although its price is relatively high. Other tested Fe alloys, namely grey iron according to CSN 42 2415, structural steel 11 373 according to CSN 41 1373 and wear resistant cast steel VPH 6 showed also very favourable properties at the material low price. In comparison with Fe alloys the wear of all plastics was considerably higher and the plastics were considerably more expensive.