BS ISO 9352:2012 pdf download.Plastics – Determination of resistance to wear by abrasive wheels.
BS ISO 9352 specifies a general method for determining the resistance to abrasive wear of plastics under the action of abrasive wheels. It is equally applicable to moulded test specimens, components and finished products.
1.2 The particular test conditions and the method of expressing the results may differ according to the type of material. The test conditions and specific method are specified in the relevant standards for each material or product.
This method is not applicable to cellular materials or paints.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and 100 IRHD)
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General principles, and moulding of multipurpose and bar test specimens
ISO 295, Plastics — Compression moulding of test specimens of thermosetting materials
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 abrasive wheel
small grinding wheel or a roller faced with abrasive paper
3.2 abrasive wear
progressive loss of material from the operating surface of a plastics material resulting from the cutting or scratching action of the abrasive wheel
4 Principle
Two abrasive wheels are applied to the test specimen with a specified load. The wear obtained after rotation of the test specimen through a specified number of revolutions is assessed by an appropriate procedure (e.g. mass loss, volume loss, change in optical properties).
5 Apparatus
5.1 Abrasion test machine.
5.1.1 The test specimen is placed on a motor-driven rotating disc. A pair of abrasive wheels is allowed to turn 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 driving 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 rev/mm 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土0,2 mm and a diameter of 51,6 mm土0,2 mm. The width of the abrasive paper shall be as specified in the relevant material (or product) standard.BS ISO 9352 pdf download.