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ISO 9352-2012 pdf free download
ISO 9352-2012 pdf free download.Plastics — Determination of resistance to wear by abrasive wheels
Plastiques — Determination de Ia résistance a l’usure par galets abrasils.
freely on their axis and is applied to the test specimen at a specified position under a specified load. Figure 1 illustrates the relative positions of these different components. The apparatus shall comply with the requirements given in 5.1.2 to 5.1.7.
5.1.2 The test specimen support disc shall be flat and fixed to its dflving shaft. When the disc is rotated, no point on a 45 mm radius circle traced on its horizontal surface shall oscillate vertically through more than 0,05 mm about its mean position. The disc shall have a nominal diameter of 100 mm and its speed of rotation shall be 72 revlmin at 60 Hz and 60 rev/mm at 50 Hz.
5.1.3 The abrasive wheels shall be supported by two symmetrical arms that can oscillate freely about a horizontal axis. The method of attaching the wheels shall permit free rotation, e.g. by means of ball bearings. In the test position, the mounting bosses shall be coaxial and positioned in such a way that the vertical projection of their common axis on to the plane of the test specimen support disc is 19,1 mm ± 0.1 mm from a parallel line passing through the axis of the disc (see Figure 1).
The distance between the inside faces of the abrasive wheels shall be 52,4 mm ± 0,2 mm.
Each arm shall be constructed in such a way as to permit the fitting of a counterweight to balance its mass against that of the abrasive wheel and additional loads of known mass (see 5.4).
5.1.4 The abrasive wheels shall have a cylindrical shape. They shall contain an axial hole allowing them to be fitted without play to the mounting bosses in the arms.
They shall consist of one of the following two alternatives:
a) An abrasive material (abrasive wheels). The thickness of the wheels shall be 12,7 mm 0,1 mm and their external diameter 51,6 mm ± 0,1 mm when new, but in no case less than 44,4 mm.
b) A metal disc with its periphery clad with a 6 mm layer of vulcanized rubber of hardness 50 IRHD to 55 IRHD (international hardness in accordance with ISO 48) bonded without gaps or overlap with a strip of abrasive paper (for example, secured with the aid of double-sided adhesive tape). The abrasive wheel shall have a thickness of 12,7 mm ± 0,2mm and a diameter of 51,6mm ± 0,2 mm. The width of the abrasive paper shall be as specified in the relevant material (or product) standard.
The quality of the abrasive wheel or abrasive paper to be used shall be as stated in each relevant material (or product) specification. Refer to Table I for guidance in selecting suitable abrasive wheels. The abrasive-power properties of the wheels may be characterized, if requested, by the procedure give in Annex A.
5.1.5 The vacuum device for removal of the wear debris shall include two exhaust nozzles above the test specimen wear zone. One nozzle shall be located between the abrasive wheels and the other shall be located diametrically opposite (see Figure 1). The bore of each nozzle shall have an internal diameter of 8 mm ± 0,5 mm and its distance from the test specimen shall be maintained at 1.5 mm ± 0,5 mm. When the nozzles are blocked closed, the pressure shall be 1,5 kPa to 1,6 kPa.ISO 9352-2012 pdf free download.
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