Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p19
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 19/43)
Character Range: 194837–197528

6. Optical qualities
 The requirements concerning optical qualities set out in Annex 3, paragraph 9., shall apply to every type of windscreen. This shall not apply to flat windscreens which fall within an already approved group if the rake angle is less than 40° to the vertical.
Annex 7
  Laminated-glass panes
1. Definition of type
 Laminated-glass panes shall be deemed to belong to different types if they differ in at least one of the following principal or secondary characteristics.
1.1. The principal characteristics are as follows:
1.1.1. The trade names or marks.
1.1.2. The thickness category of the pane in which the nominal thickness 'e' lies, a manufacturing tolerance of ±0.2 . n mm ('n' being the number of layers of glass in the pane) being allowed:
 Category I                 e  5.5 mm
 Category II 5.5 mm < e  6.5 mm
 Category III 6.5 mm < e
1.1.3. The nominal thickness of the interlayer or interlayers,
1.1.4. The nature and type of the interlayer or interlayers, e.g. PVB or other plastics-material interlayer or interlayers,
1.1.5 Any special treatment which one or more layers of glass may have undergone.
1.2. The secondary characteristics are as follows:
1.2.1. The nature of the material (polished (plate) glass, float glass, sheet glass),
1.2.2. The colouring (total or partial) of the interlayer or interlayers (colourless or tinted),
1.2.3. The colouring of the glass (colourless or tinted).
1.2.4. The incorporation or otherwise of opaque obscuration.
2. General
2.1. In the case of laminated-glass panes, the tests shall be conducted on flat test pieces which are either cut from actual glass glazing or are specially made. In either case the test pieces shall be in all respects rigorously representative of the glass glazing for the production of which approval is sought.
2.2. Before each test the test pieces of laminated glass shall be stored for not less than four hours at a temperature of 23 °C ± 2 °C. The tests shall be performed on the test pieces as soon as the test pieces have been taken out of the receptacle in which they were stored.
2.3. The provisions of this annex shall be considered to be met if the glazing submitted for approval is of the same composition as a windscreen already approved under the provisions of Annex 6 or Annex 8 or Annex 9.
3. Mechanical strength test - 227 g ball test
3.1. Indices of difficulty of the secondary characteristics
 No secondary characteristic is involved.
              3.2. Number of test pieces

 Eight flat samples measuring 300 mm x 300 mm, specially made or cut from the flattest part of a pane shall be tested
              3.2.1. Test pieces can alternatively be finished products that may