Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p24
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 24/43)
Character Range: 207419–210140

sheet glass),
1.2.2. The colouring (total or partial) of any layer(s) of plastics (colourless or tinted),
1.2.3. The colouring of the glass (colourless or tinted),
1.2.4. The incorporation or otherwise of conductors,
1.2.5. The incorporation or otherwise of opaque obscuration.
2. General
2.1. In the case of glass-plastics windscreens, tests other than headform tests (paragraph 3.2.) and tests of optical qualities shall be conducted on flat test pieces which are either cut from actual windscreens or are specially made for the purpose. In either case the test pieces shall in all respects be, rigorously representative of the serially-produced windscreens for which approval is sought.
2.2. Before each test, the test pieces shall be stored for not less than four hours at a temperature of 23 °C ± 2 °C. The tests shall take place as soon as possible after the test pieces have been taken out of the receptacle in which they were stored.
3. Headform test
3.1. Indices of difficulty of the secondary characteristics
 No secondary characteristic is involved.
3.2. Headform test on a complete windscreen
3.2.1. Number of test pieces
 Four test pieces from the series having the smallest developed area and four test pieces from the series having the largest developed area, selected in accordance with the provisions of Annex 13, shall be tested.
3.2.2. Test method
3.2.2.1. The method used shall be that described in Annex 3, paragraph 3.1.
3.2.2.2. The height of drop shall be 1.50 m           mm.
3.2.3. Interpretation of results
3.2.3.1. This test shall be considered to have given a satisfactory result if the following conditions are met.
3.2.3.1.1. The layer of glass breaks, displaying numerous circular cracks centred approximately on the point of impact, the cracks nearest to the point of impact being not more than 80 mm from it;
3.2.3.1.2. The layer of glass remains adhering to the plastics material interlayer. One or more partial separations from the interlayer not more than 4 mm in breadth may be allowed on either side of the crack outside a circle 60 mm in diameter centred on the point of impact;
3.2.3.1.3. A tear in the interlayer of a length up to 35 mm is allowed on the impact side.
3.2.3.2. A set of samples submitted for approval shall be considered satisfactory from the point of view of the headform test if all of the tests have given a satisfactory result.
4. Mechanical strength test
4.1. Indices of difficulty, test method and interpretation of results
 The requirements of Annex 6, paragraph 4., shall apply.
4.2. However the third requirement set out in paragraph 4.3.4.1. of Annex 6 is not relevant.
5. Test of resistance to the environment
5.1. Test of resistance to abrasion
5.1.1.