For intermediate values of thickness in the interval between 3 mm and 6 mm the height of drop shall be interpolated.
5.4. Interpretation of results
5.4.1.
The ball test shall be considered to have given a satisfactory result if the following conditions are met:
(a) The ball does not penetrate the test piece
(b) The test piece does not break into separate pieces.
5.4.2.
A set of test pieces submitted for approval shall be considered satisfactory from the point of view of the 227 g ball test if one of the following conditions is met:
5.4.2.1.
Eight or more separate tests give a satisfactory result at the drop height.
5.4.2.2.
Three or more tests having given an unsatisfactory result, a further series of tests carried out on a new set of test pieces gives satisfactory results.
5.5. 227 g ball test at – 18 °C ± 2 °C
5.5.1.
To minimise the temperature change of the test piece, the test shall be performed within 30 seconds of the removal of the test piece from the conditioning appliance.
5.5.2.
The test method shall be that described in paragraph 5.3 of this annex, except that the test temperature is – 18 °C ± 2 °C.
5.5.3.
Interpretation of results as in paragraph 5.4 of this annex.
6. TEST RESISTANCE TO THE ENVIRONMENT
6.1. Test of resistance to abrasion
6.1.1. Indices of difficulty and test method
The requirements of Annex 3, paragraph 4, shall apply; the test is performed for either 1 000, 500 or 100 cycles to measure abrasion of the surface of the product.
6.1.2. Three flat square test pieces of 100 mm for each type of surface shall be subjected to testing.
6.1.3. Interpretation of results
6.1.3.1.
In the case of glazing of class L, the abrasion test shall be considered to have given a satisfactory result if the total light scatter after abrasion does not exceed 2 per cent after 1 000 cycles on the outer surface of the test sample and 4 per cent after 100 cycles on the inner surface of the test sample.
6.1.3.2.
In the case of glazing of class M, the abrasion test shall be considered to have given a satisfactory result if the total light scatter after abrasion does not exceed 10 per cent after 500 cycles on the outer surface of the test sample and 4 per cent after 100 cycles on the inner surface of the test sample.
6.1.3.3.
For sun roofs, no abrasion test is required.
6.1.4. A set of samples for approval shall be considered satisfactory if one of the following conditions is met:
(a) All samples meet the requirements or
(b) One sample having failed, a repeat of the tests on a new set of samples gives a satisfactory result.
6.2. Test of resistance to simulated weathering
6.2.1. Indices of difficulty and test method
The requirements of Annex 3, paragraph 6.4 shall apply. The total ultraviolet radiant exposure with the long arc xenon lamp shall be 500 MJ/m
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