BS ISO 3917:2016 download

06-28-2021 comment

BS ISO 3917:2016 download.Road vehicles — Safety glazing materials — Test methods for resistance to radiation, high temperature, humidity, fire and simulated weathering.
BS ISO 3917 specifies test methods br resistance to radiation, high temperature. humidity, fire and simulated weathering, relating to the safety requirements for all safety glazing materials In a road vehicle, whatever the type of glass or the material of which they are composed.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the btest edition of the referenced document (induding any amendments) applies.
ISO 3536, Road vehicles — Safety glazing materials — Vocabulary
ISO 3537. Rood vehicles — Safety glazing materials — Mechanical tests
ISO 3538, Road vehicles — Safety glazing materials — Test methods for optical properties
ISO 4892’2:2013, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
3 Terms and definitions
For the purposes of BS ISO 3917, the terms and definitions given In ISO 3536 apply.
4 Test conditions
Unless otherwise specitied, the test shall be carried out under the following conditions:
— ambient temperature: 20 C ± 5 DC
— atmospheric pressure: 86 kPa to 106 kPa (860 mbar to 1 060 mbar);
— relative humidity: (60 ± 20) %.
S Application of test
For certain types or safety glazing material. Iris not necessary to carry out all the tests specified In this International Standard.
6 Radiation test
6.1 Principle
Determination of whether exposure to radiation over an extended period of time produces any appreciable decrease in regular luminous transmittance or any pronounced discoloration of the safety glazing material
6.2 Apparatus
62.1 RadiatIon source
Radiation source, consisting of a medium pressure mercury arc lamp with a tubular quartz bulb of ozone-free type. The bulb axis shall be vertical and equipped with a suitable filter tube removing radiation below 300 nm. The lamp should operate at a power of 750 Wi SOW’)
Any other source of radianon 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 nm to 450 nm, 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 material for which there is no satisfactory correlation between this test and the conditions of use. it will be necessary to review the test conditions.
6.22 Power supply
The power supply shall be capable of supplying adequate power to the lamp.
6.2.3 Device for mounting and rotating the test specimens
The device shall be capable of mounting and rotating the test specimens at I r/min to 5 r/min about the centrally located radiation source in order to ensure even exposure.
6.3 Test specimens
The size of the test specimens shall be 76 mm ‘300 mm.
6.4 Procedure
Measure the regular luminous transmittance, determined according to ISO 3536, of three test specimens before exposure. Protect a portion of each test specimen from the radiation, and then position the test specimen in the test apparatus 230 mm from, and with Its 300mm dimensIon parallel to the lamp axis. Maintain the temperature of the test specimens at 45 °C ± 5 °C throughout the test.
The surface of each test specimen which would represent the outside face of the safety gLazing material when mounted on the vehicle shall face the lamp. For the type of Lamp specified in 62.1, the exposure time shall be 100 h.
After exposure, measure the luminous transmittance again on each test specimen In the exposed area.
6.5 Expression of results
The results of the luminous transmission measurement of the exposed test specimen shall be compared with the values obtained for unexposed test specimens of the same material
Changes in colour shall be evaluated either by
— examining the test specimens placed upon a white background and comparing the exposed area with the area which was protected from the radiation or
— measuring the trichromatic coordinates of the test specimen before and after ageing and by calculating the difference between two colours according to the CIE2) prescriptions.
1) A medium pressure mercwy arc Lamp which yields radiation spectra in the appropriate range at the specified operating parameters is available under the trade name Heraeus Noblelight Q 701. modifIed by means of a UV-C filter tube.
2) International Commission on Illumination,
8.3 ExpressIon of results
The resistance to humidity shall be evaluated visually by reference to change in the appearance of the safety glazing material after testing. i.e.:
— separation of materials;
— loss of transparency according to ISO 3538.
A waiting period of 48 h after exposure prior to evaluation is permitted. if necessary
The changes shall be assessed over the whole test specimen and any changes which extend more than
6 mm from an uncut edge or 10 mm from a cut edge shall be reported.
9 Fire resistance test
Alternatively, the apparatus and method described in ISO 3795 maybe used.
9.1 PrInciple
The purpose olthis test is to determine the horizontal burning rate of safety glazing materials, of which at least one surface is plastic, after exposure to a small flame.
9.2 Apparatus
a) The test shall be conducted In a laboratory hood or draft-free enclosure greater than 0.5 m3 In size and provided with a means for venting the fumes from burning test specimens. If a hood Is used, Its exhaust fan will be turned off during the test but allowed to run periodIcally to clear out the fumes between tests.
b) The test specimen shall be clamped in a suitable holder, at the end farthest from the 25 mm mark. with its longitudinal axis horizontal and its transverse axis inclined at 45 • to the horizontal. The specimen is held with the plastic surface downward, lacing the (lame.
c) Under the test specimen there shall be clamped a 20 mesh per 25.4 mm Bunsen burner gauze, about 125mm square, In a horizontal positIon 6mm below the edge of the test specimen and with about
13 mm of the test specimen extending beyond the edge of the gauze as Illustrated in FIgure 1
d) The flame is provided by a Bunsen burner. The gas supplied to the burner shall have a caloric value olabout 38 MI/rn3 (for example. natural gas).
9.3 Test specimens
a) At least three 150 mm 13 mm fiat test specimens shall be tested, The test speciniens shall be marked by Inscribing two lines, 25 mm and 100mm from one end of each specimen.
b) The specimens shall be conditioned for at least 48 h, at a temperature of 23 °C ± 2 ,C and a relative humidity of (50 ± 5) %, and shall be maintained under these conditions until immediately prior to the test,
9.4 Procedure
a) A Bunsen burner with a stable, blue, gas Flame 12 mm to 20mm in height shall be placed under the free end of the test specimen and adjusted so that the flame tip is ‘ust in contact with the test specimen.
b) At the end of 30s, the flame shall be removed and the test specimen allowed to burn,
c A stopwatch shall be started when the flame reaches the first mark, 25 mm from the free end, and the time recorded when the flame reaches the 11)0mm mark.

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