Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:254:p6
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 254 (pt 6/18)
Character Range: 114294–117026

of the lamp shall be 360 mm in length by 9.5 mm in diameter. The arc length shall be 300 mm ± 4 mm. The lamp shall be operated at 750 W ± 50 W.

               Any other source of radiation which produces the same effect as the lamp specified above may be used. To check that the effects of another source are the same, a comparison shall be made by measuring the amount of energy emitted within a wavelength range of 300 to 450 nanometers, all other wavelengths being removed by the use of suitable filters. The alternative source shall then be used with these filters.

               In the case of safety glazing for which there is no satisfactory correlation between this test and the conditions of use it will be necessary to review the test conditions.

              6.1.1.2. Power-supply transformer and capacitor capable of supplying to the lamp (paragraph 6.1.1.1.) a starting peak voltage of 1,100 V minimum and an operating voltage of 500 V ± 50 V.

              6.1.1.3. Device for mounting and rotating the test pieces at 1 to 5 rev/min about the centrally-located radiation source in order to ensure even exposure.

              6.1.2. Test pieces

              6.1.2.1. The size of the test pieces shall be 76 mm x 300 mm.

              6.1.2.2. The test pieces shall be cut by the laboratory from the upper part of the glazing in such a way that:

               In the case of glass panes, the upper edge of the test piece coincides with the upper edge of the glass pane.

               In the case of windscreens, the upper edge of the test piece coincides with the upper limit of the zone in which regular transmittance shall be measured, determined in accordance with paragraph 9.1.2.2. of this annex.

              6.1.3. Procedure

               Check the regular light transmittance, determined according to paragraphs 9.1.1. to 9.1.2. of this annex, of three test pieces before exposure. Protect a portion of each test piece from the radiation, and then place the test pieces in the test apparatus 230 mm from and parallel lengthwise to the lamp axis. Maintain the temperature of the test pieces at 45 °C ± 5 °C throughout the test.

               That face of each test piece which would constitute a glazed exterior part of the vehicle shall face the lamp. For the type of lamp specified in paragraph 6.1.1.1. the exposure time shall be 100 hours. After exposure, measure the regular light transmittance again in the exposed area of each test piece.

              6.1.4. Each test piece or sample (total number 3 pieces) shall be subjected, in accordance with the procedure above, to radiation such that the radiation on each point of the test piece or sample produces on the interlayer used the