Document ID: chunk:federal_register_of_legislation:F2023C00228:reg:1:p1
Version: federal_register_of_legislation:F2023C00228
Segment Type: reg
Provision Reference: reg 1 (pt 1/35)
Character Range: 447377–450361

1                                                                  2
2.1. Deterioration(para. 2.6.1.1) 2.2. Photometry(para. 2.6.1.2)   X
2.3. Adherence (para. 2.6.2)                                       X
                                                                                      X

       Annex 7 - Appendix 2

METHOD OF MEASUREMENT OF THE DIFFUSION AND TRANSMISSION OF LIGHT

       1. EQUIPMENT (see figure)

       The beam of a collimator K with a half divergence

       is limited by a diaphragm DT with an opening of 6 mm against which the sample stand is placed.

       A convergent achromatic lens L2, corrected for spherical aberrations, links the diaphragm DT with the receiver R; the diameter of the lens L2 shall be such that it does not diaphragm the light diffused by the sample in a cone with a half top angle of beta/2 = 14 degrees.

       An annular diaphragm DD with angles

       is placed in an image focal plane of the lens L2.

       The non-transparent central part of the diaphragm is necessary in order to eliminate the light arriving directly from the light source.  It shall be possible to remove the central part of the diaphragm from the light beam in such a manner that it returns exactly to its original position.

       The distance L2 DT and the focal length F2 [1/] of the lens L2 shall be so chosen that the image of DT completely covers the receiver R.

       When the initial incident flux is referred to 1,000 units, the absolute precision of each reading shall be better than 1 unit.

       2. MEASUREMENTS

       The following readings shall be taken:

Reading  With sample        With central part of DD  Quantity represented
T1       No                 No                       Incident flux in initial reading
T2       Yes (before test)  No                       Flux transmitted by the new material in a field of 24 degrees C
T3       Yes (after test)   No                       Flux transmitted by the tested material in a field of 24 degrees C
T4       Yes (before test)  Yes                      Flux diffused by the new material
T5       Yes (after test)   Yes                      Flux diffused by the tested material

       Annex 7 - Appendix 3

       SPRAY TESTING METHOD

       1. Test equipment

       1.1. Spray gun

       The spray gun used shall be equipped with a nozzle 1.3 mm in diameter allowing a liquid flow rate of 0.24 +/- 0.02 1/minute at an operating pressure of 6.0 bars - 0, + 0.5 bar. Under these operation conditions the fan pattern obtained shall be 170 mm +/- 50 mm     in diameter on the surface exposed to eterioration, at a distance of 380 mm +/- 10 mm from the nozzle.

       1.2. Test mixture

       The test mixture shall be composed of:

       Silica sand of hardness 7 on the Mohr scale, with a grain size between 0 and 0.2 mm and an almost normal distribution, with an angular factor of 1.8 to 2;

       Water of hardness not exceeding 205 g/m3 for a mixture comprising