Document ID: chunk:federal_register_of_legislation:F2023C00158:front:0:p17
Version: federal_register_of_legislation:F2023C00158
Segment Type: other
Provision Reference: 
Character Range: 44704–47504

to dust as follows:

       1.2.2.2.1. Device openings

       All drain holes and other openings shall remain open.  Drain wicks, when used, shall be tested in the device.

       1.2.2.2.2. Dust exposure

       The mounted device shall be placed in the dust chamber no closer than 150mm from a wall.  Devices with a length exceeding 600mm shall be horizontally centred in the test chamber.  The test dust shall be agitated as completely as possible by compressed air or blower(s) at intervals of 15min for a period of 2 to 15s for the duration of 5 hours.  The dust shall be allowed to settle between the agitation periods.

       1.2.2.2.3. Measured sample evaluation

       Upon completion of the dust exposure test, the exterior of the device shall be cleaned and dried with a dry cotton cloth and the CIL measured according to the method specified in annex 4, paragraph 3.2.

       2. RESISTANCE TO CORROSION

       2.1. Retro-reflecting devices must be so designed that they retain the prescribed photometric and colorimetric characteristics despite the humidity and corrosive influences to which they are normally exposed.  The resistance of the front surface to tarnishing and of the protection of the rear face to deterioration shall be checked, particularly when an essential metal component seems liable to be attacked.

       2.2. The retro-reflecting device, or the lamp if the device is combined with a light, shall be stripped of all removable parts and subjected to the action of a saline mist for a period of 50 hours, comprising two periods of exposure of 24 hours each, separated by an interval of two hours during which the sample is allowed to dry.

       2.3. The saline mist shall be produced by atomizing, at a temperature of 35 degrees +/- 2 degrees C, a saline solution obtained by dissolving 20 +/- 2 parts by weight of sodium chloride in 80 parts of distilled water containing not more than 0.02% of impurities.

       2.4. Immediately after completion of the test, the sample must not show signs of excessive corrosion liable to impair the efficiency of the device.

       3. RESISTANCE TO FUELS

       The outer surface of the retro-reflecting device and, in particular, of the illuminating surface, shall be lightly wiped with a cotton cloth soaked in a mixture of 70 vol. % of n- heptane and 30 vol. % of toluol. After about five minutes, the surface shall be inspected visually.  It must not show any apparent surface changes, except that slight surface cracks will not be objected to.

       4. RESISTANCE TO LUBRICATING OILS

       The outer surface of the retro-reflecting device and, in particular, the illuminating surface, shall be lightly wiped with a cotton cloth soaked in a detergent lubricating oil. After about 5 minutes, the surface shall be