Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p29
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 29/43)
Character Range: 220893–224329

7. A few windscreens having significantly different parameters of shape and/or curvature from the extremes of the selected groups may also be tested if the technical service conducting the tests considers that the parameters in question are likely to have appreciably adverse effects.

              8. The limits of the group are determined by developed area of windscreen. Where a windscreen submitted for type-approval has a developed area outside the approved limits and/or has a significantly greater height of segment or a significantly smaller curvature, it shall be considered to be of a new type and shall be subjected to additional tests if the technical service deems such tests technically necessary, having regard to the information already in its possession concerning the product and the material used.

              9. Should any other windscreen model subsequently be manufactured by the holder of an approval in a thickness class already approved:

              9.1. It shall be ascertained whether that model can be included among the five largest or the five smallest selected for approval of the group in question;

              9.2. Numbering by the procedures defined in paragraphs 3., 4. and 5. above shall be performed again.

              9.3. If the sum of the numbers assigned to the windscreen newly incorporated among the five largest or the five smallest windscreens

              9.3.1. Is found to be the smallest, the following tests shall be carried out:

              9.3.1.1. For toughened-glass windscreens:

              9.3.1.1.1. Fragmentation,

              9.3.1.1.2. Headform test,

              9.3.1.1.3. Optical distortion,

              9.3.1.1.4. Separation of secondary image,

              9.3.1.1.5. Light transmission.

              9.3.1.2. For ordinary laminated-glass or glass-plastics windscreens:

              9.3.1.2.1. Headform test,

              9.3.1.2.2. Optical distortion,

              9.3.1.2.3. Separation of secondary image,

              9.3.1.2.4. Light transmission.

              9.3.1.3. For treated laminated-glass windscreens, the tests prescribed in paragraphs 9.3.1.1.1., 9.3.1.1.2. and 9.3.1.2.

              9.3.1.4. For windscreens faced with plastics material, the tests prescribed in paragraph 9.3.1.1. or 9.3.1.2., as the case may be.

              9.3.2. If not, only the tests prescribed for checking optical qualities as described in Annex 3, paragraph 9., shall be carried out.

Annex 14
  Rigid plastic panes
              1. Definition of type

               Rigid plastic glazings shall be considered to belong to different types if they differ in at least one of the following principal or secondary characteristics.

              1.1. The principle characteristics are as follows:

              1.1.1. Trade names or marks;

              1.1.2. The chemical designation of the material.

              1.1.3. The classification of the material by the manufacturer.

              1.1.4. The process of manufacture.

              1.1.5. The shape and dimensions.

              1.1.6. The nominal thickness. The thickness tolerance limit for extruded plastic products is ±l0  per cent of the nominal thickness. For plastic products produced by other techniques (e.g. cast acrylic sheet), the acceptable thickness tolerance is given by the equation (thickness tolerance limits (mm) = ± (0.4 + 0.1 . e) where e is the