UL-1694:2015 pdf free download – STANDARD FOR SAFETY Tests for Flammability of Small Polymeric Component Materials.
6.2 Test specimens
6.2.1 If possible, the specimen should be a complete component or sub-assembly. If it is necessary to cut off a suitable part to perform the test, care must be taken to ensure that the test conditions are not significantly different from those occurring in normal use with regard to shape, ventilation, effect of thermal stresses and possible flames occurring or burning or glowing particles falling in the vicinity of the specimen.
6.2.2 lIthe test cannot be made on the complete specimen, a suitable part may be cut from it. If the specimen is a part cut from a larger unit, care must be taken to ensure that in this particular case, the test flame is not applied incorrectly, for example, to an edge created by cutting.
6.3 Conditioning
6.3.1 Five samples of the small component shall be tested as described in this Standard following preconditioning for a minimum of 48 h at 23±2°C and 50±10% Relative Humidity in accordance with ASTM D 618 (ISO 291).
6,3.1 revised November 24. 2010
6.3.2 Another five samples of the small component are to be placed in a forced draft air-circulating oven and maintained at a temperature of 70°C (158°F). The samples are to remain in the oven for a minimum of 24 hours and then cooled in the desiccator for a minimum of 2 hours. The samples are to be tested as described in this Standard within 30 minutes following removal from the desiccator.
6.3.3 Cotton shall be conditioned in a desiccator for at least 24 hours prior to use.
6.3.4 Once removed from the desiccator, the cotton shall be used within 30 minutes.
6.3.5 All specimens shall be tested in a laboratory atmosphere at 15°C to 35°C and 45 percent to 75 percent relative humidity.
6.4 Procedure
6.4.1 Five samples of the small component are to be subjected to the flame test described in 6.4.3 — 6.4.5. In the performance of the test, the specimen shall be arranged in its most unfavorable position of normal use. The means to fix the specimen shall not influence the effect of the test flame or the propagation of flames in a way other than that occurring under normal conditions of use. For example of typical test positions, see Figure 6.1.
6.4.2 The bottom edge of the small component shall be located 200 ±5 mm above a horizontal layer of absorbent 100 percent cotton thinned to approximately 50 mm by 50 mm having a maximum thickness of 6 mm. The weight of the cotton shall not exceed 0.08 g.
6.4.3 With the central axis of the burner tube vertical, place the burner remote from the specimen and set the burner to produce a standardized test flame with a height of 12 mm ±1 mm — when viewed in subdued light against a dark background and using the test jig shown in Figure 6.4 that conforms with IEC 60695-11-5. Wait a period of at least 5 minutes to allow the burner conditions to reach equilibrium.
6.4.4 The test flame shall be calibrated in accordance with lEG 60695-11-5 . using the copper block, thermocouple, temperature indicator, and timing devices, as shown in Figures 5.1 and 5.2, at least bi-monthly and when the gas supply is changed, test equipment replaced, or when data is questioned. The mean time for the temperature of the block to increase from 100°C ±2°C to 700°C ±3°C shall be within the range of 23.5 ±1.0 seconds after three determinations. The block shall be allowed to cool naturally in air to below 50°C between determinations.