Document ID: chunk:federal_register_of_legislation:F2023C00228:front:0:p63
Version: federal_register_of_legislation:F2023C00228
Segment Type: other
Provision Reference: 
Character Range: 169541–172219

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 25 g of sand per litre of water.

       2. Test

       The outer surface of the lamp lenses shall be subjected once or more than once to the action of the sand jet produced as described above.  The jet shall be sprayed almost perpendicular to the surface to be tested.

       The deterioration shall be checked by means of one or more samples of glass placed as a reference near the lenses to be tested.  The mixture shall be sprayed until the variation in the diffusion of light on the sample or samples measured by the method described in appendix 2, is such that: Δ ±

       Several reference samples may be used to check that the whole surface to be tested has deteriorated homogeneously.

Annex 6 - Appendix 4

ADHESIVE TAPE ADHERENCE TEST

       1. PURPOSE

       This method allows to determine under standard conditions the linear force of adhesion of an adhesive tape to a glass plate.

       2. PRINCIPLE

       Measurement of the force necessary to unstick an adhesive tape from a glass plate at an angle of 90 degrees.

       3. SPECIFIED ATMOSPHERIC CONDITIONS

       The Ambient conditions shall be at 23 degrees C +/- 5 degrees C and 65 +/- 15 % relative humidity (RH).

       4. TEST PIECES

       Before the test, the sample roll of adhesive tape shall be conditioned for 24 hours in the specified atmosphere (see para. 3 above).

       Five test pieces each 400 mm long shall be tested from each roll.  These test pieces shall be taken from the roll after the first three turns were discarded.

       5. PROCEDURE

       The test shall be under the ambient-conditions specified in paragraph 3.

       Take the five test pieces while unrolling the tape radially at a speed of approximately 300 mm/s, then apply them within 15 seconds in the following manner:

       Apply the tape to the glass plate progressively with a slight lengthwise rubbing movement of the finger, without excessive pressure, in such a manner as to leave no air bubble between the tape and the glass plate.

       Leave the assembly in the specified atmospheric conditions for 10 minutes.

       Unstick about 25 mm of the test piece from the plate in a plane perpendicular to the axis of the test piece.

       Fix the plate and fold back the free end of the tape at 90 degrees.  Apply force in such a manner that the separation line between the tape and the plate is perpendicular to this force and perpendicular to the plate.

       Pull to unstick at a speed of 300 mm/s +/- 30 mm/s and record the force