BS ISO 20329:2020 pdf free.Plastics – Determination of abrasive wear by reciprocating linear sliding motion.
BS ISO 20329 The test apparatus shall consist of specimen stage, specimen holder, test specimen setting guide, wheel,loading system, and a linear reciprocating motion system. The specimen stage shall enable test specimen to be installed horizontally, and shall have an opening to allow abrasive material to come in contact with test specimen from underneath. The specimen holder shall be capable of maintaining the horizontal position of test specimen on specimen stage during reciprocating motion of the specimen stage and test specimen.The test specimen setting guide shall enable the test specimen to be repositioned in the same location on the specimen stage.The wheel shall be made from metals having elastic modulus of at least 60 GPa with diameter of (50 + 0,5) mm and width of(12 + 0,2) mm. The wheel rotates 0,9° for each reciprocating motion of the specimen stage and test specimen, and makes a full round of rotation with 400 reciprocating motions.The maximum load applied to abrasive contact by the loading system is up to 19,6 N and shall be variable with an accuracy of+ 5 %.The linear reciprocating motion system shall be equipped for the reciprocating motion of specimen stage and test specimen. Single stroke of reciprocating motion shall be 30 mm in length, and reciprocating frequency shall be [40土2) reciprocations per minute.Silicon carbide abrasive paper as specified in ISO 6344-1 is recommended as abrasive material. It shall be in strip form with a width of (12,0土0,2) mm. The length shall be such so that the wheel is covered without any overlap or gap, where 159 mm is most suitable. Use either double sided adhesive tape to attach abrasive material to wheel or abrasive material with adhesive tape backing. Other types of abrasive materials can be used under agreement between the interested parties.Test specimens shall be flat and typically 50 mm x 50 mm, with at least 50 mm in the direction of reciprocating motion. Typical thickness of test specimens is from 1 mm to 5 mm. Test specimens specified in ISO 20753 can also be used. Determine the size of test specimens so that the mass of specimens do not exceed capacity of balances being used.BS ISO 20329 pdf download.