BS ISO 3320:2015 pdf download

BS ISO 3320:2015 pdf download.Road vehicles一Safety glazing materials – Mechanical tests. 7.2 Apparatus 7.Lt Hardened steel balL with a mass oF 2 264) g ± 20 g and a diameter of approximately 82mm. 7.22 Means for dropping the ball Freely from a height to be specified. or meals for giving the ball a velocity equivalent to that obtaIned by the Free Fail. When a device to ptofrct the ball is used, the toleranceon velocity shall be ±1% olthevelocity equivalent to that obtained by the Free lalL 7.2.3 SupportIng flature, as di %crlbed in 6.22. 7.3 Test piece The test piece shall be a Flat square with 300 mm skies or shall be cut out from the flattest part of a windscreen or other curved safety glazing material, Alternatively, the whole windscreen or other finished safety glazing products can be tested, using the supporting fixture according to 6.2.3. In the case of curved test pieces, care shall be taken to ensure adequate contact between the safety glazing material and the support. 7.4 Procedure Condition the test piece the speciFied temperature for at least 4 h immediately preceding the trt. Place the test piece in the flxture (lil.3). The plane o(the test piece shall be perpendicular, within 3. to the incident direction oF the ball. When necessary to retain the test piece in the Fixture, the test piece In the fixture shall be clamped to ensure that the movement of the test piece during test shall not exceed 2 mm at any paint along the inside periphery o(the fixture. The point of impact shall be within 25mm of the geometric centre of the test piece. The ball shall strike the face of the test piece which represents the Internal lace of the safety glazing material when mounted on the vehicle, The ball shall be allowed to make only one impact. 7. Expression of results lithe ball passescompletely through the testpiece within 5 salter the Impact, the result shall be recorded as a ‘penetration”. If the ball remains on top of the test piece, or wedged in a hole. Few S s or more, the result shall be recorded as a ‘support’. Report the drop height and temperature for each test poce. 8 Abrasion resistance test Test rigid plasti safety g1a’’ materials in accordance with 1Sf) I 5082. 8.1 PrincIple Determination of whether the safety glazing material has a certain minimum resistance to...