Document ID: chunk:federal_register_of_legislation:F2023C00154:front:0:p31
Version: federal_register_of_legislation:F2023C00154
Segment Type: other
Provision Reference: 
Character Range: 81232–83713

shall then be inspected visually; no distortion, deformation, cracking or change in colour of either the front fog lamp lens or the external lens, if any, shall be noticeable.
1.1.3.2. Photometric test
To comply with the requirements of this Regulation, the following photometric values shall be verified in the following points:
In case of Class "B" front fog lamps: at point HV and the point of Imax in zone D.
In case of Class"F3" front fog lamps: on line 5 at point h = 0 and the point of Imax in zone D.
Another aiming may be carried out to allow for any deformation of the front fog lamp base due to heat (the change of the position of the cut-off line is covered in paragraph 2. Of this annex).
A 10 per cent discrepancy between the photometric characteristics and the values measured prior to the test is permissible including the tolerances of the photometric procedure.
1.2. Dirty front fog lamp
The front fog lamp, having been tested as specified in paragraph 1.1. above shall be operated for one hour as described in paragraph 1.1.1. Following preparation, as prescribed in paragraph 1.2.1. below, it shall be checked as prescribed in paragraph 1.1.3. above.
1.2.1. Preparation of the front fog lamp
1.2.1.1. Test mixture
1.2.1.1.1. For front fog lamps with the outside lens in glass:
The mixture of water and a polluting agent to be applied to the front fog lamp shall be composed of:
(a) 9 parts by weight of silica sand with a particle size of 0-100 µm;
(b) 1 part by weight of vegetal carbon dust (beech wood) with a particle size of 0‑100 µm;
    (c) 0.2 part by weight of NaCMC,[16] and

(d) An appropriate quantity of distilled water, with a conductivity of S < l µS/m.
The mixture must not be more than 14 days old.
1.2.1.1.2. For front fog lamp with outside lens in plastic material:
The mixture of water and polluting agent to be applied to the front fog lamp shall be composed of:
(a) 9 parts by weight of silica sand with a particle size of 0‑100 µm,
(b) 1 part by weight of vegetal carbon dust (beech wood) with a particle size of 0‑100 µm,
    (c) 0.2 part by weight of NaCMC,4

(d) 13 parts by weight of distilled water with a conductivity of S < 1 µS/m, and
    (e) ±1 part by weight of surfactant.[17]

The mixture must not be more than 14 days old.
1.2.1.2. Application of the test mixture to the front fog lamp
The test mixture shall be uniformly applied to the entire light emitting surface of the front fog lamp and then left to dry. This procedure