Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:52:p2
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 52 (pt 2/6)
Character Range: 84944–87849

mm thick and of hardness 50 IRHD.

Figure 1
       Support for ball tests

              2.1.2. Test conditions

               Temperature:   20 °C ± 5 °C

               Pressure:  860 to 1,060 mbar

               Relative humidity:  60 ± 20 per cent

              2.1.3. Test piece

               The test piece shall be a flat square of side 300 + 10/-0 mm or shall be cut from the flattest part of a windscreen or other curved pane.

               Alternatively a curved pane may be tested. In this case care shall be taken to ensure adequate contact between the safety glazing and the support.

              2.1.4. Procedure

               Condition the test piece at the specified temperature for at least four hours immediately preceding the test.

               Place the test piece in the fixture (paragraph 2.1.1.3.). The plane of the test piece shall be perpendicular, within 3°, to the incident direction of the ball.

               In the case of flexible plastic glazing the test piece shall be clamped to the support.

               The point of impact shall be within 25 mm of the geometric centre of the test piece for a drop height less than or equal to 6 m, and within 50 mm of the centre of the test piece for a drop height greater than 6 m. The ball shall strike that face of the test piece which represents the outside face of the safety glazing pane when mounted on the vehicle. The ball shall be allowed to make only one impact.

              2.2. 2,260 g ball test

              2.2.1. Apparatus

              2.2.1.1. Hardened-steel ball with a mass of 2,260 g ± 20 g and a diameter of approximately 82 mm.

              2.2.1.2. Means for dropping the ball freely from height to be specified, or means for giving the ball a velocity equivalent to that obtained by the free fall. When a device to project the ball is used, the tolerance on velocity shall be ±1 per cent of the velocity equivalent to that obtained by the free fall.

              2.2.1.3. The supporting fixture shall be as shown in Figure 1 and identical with that described in paragraph 2.1.1.3.

              2.2.2. Test conditions

               Temperature:  20 °C ± 5 °C

               Pressure:  860 to 1,060 mbar

               Relative humidity: 60 ± 20 per cent.

              2.2.3. Test piece

               The test piece shall be a flat square of side 300 + 10/-0 mm or shall be cut out from the flattest part of a windscreen or other curved pane of safety glazing.

               Alternatively, the whole windscreen or other curved pane of safety glazing may be tested. In this case care shall be taken to ensure adequate contact between the safety glazing pane and the support.

              2.2.4. Procedure

               Condition the test piece at the specified temperature for at least four hours immediately preceding the test.

                Place the test piece