Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:1:p5
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 1 (pt 5/43)
Character Range: 159744–162450

comb (paragraph 10.4.5.).
10.6.2. So place the sample in the sample holder (paragraph 10.4.2.) that the exposed side faces downwards, towards the flame.
10.6.3. Adjust the gas flame to a height of 38 mm using the mark in the chamber, the air intake of the burner being closed. The flame shall burn for at least one minute, for stabilization, before the first test is started.
10.6.4. Push the sample holder into the combustion chamber so that the end of the sample is exposed to the flame, and after 15 seconds cut off the gas flow.
10.6.5. Measurement of burning time starts at the moment when the foot of the flame passes the first measuring point. Observe the flame propagation on the side (upper or lower) which burns faster.
10.6.6. Measurement of burning time is completed when the flame has come to the last measuring point or when the flame is extinguished before reaching that point. If the flame does not reach the last measuring point, measure the burnt distance up to the point where the flame was extinguished. Burnt distance is the part of the sample destroyed, on the surface or inside, by burning.
10.6.7. If the sample does not ignite or does not continue burning after the burner has been extinguished, or the flame goes out before reaching the first measuring point, so that no burning time is measured, note in the test report that the burning rate is 0 mm/min.
10.6.8. When running a series of tests or performing repeat tests, make sure before starting a test that the temperature of the combustion chamber and sample holder does not exceed 30 °C.
10.7. Calculation
 The burning rate B, in millimetres per minute, is given by the formula:
 B = s/t x 60;
 where:
 s is the burnt distance, in millimetres,
 t is the time, in seconds, taken to burn the distance s.
10.8. Indices of difficulty of the secondary characteristics
 No secondary characteristics are involved.
10.9. Interpretation of results
10.9.1. Safety glazing faced with plastics material (paragraph 2.4. of this Regulation) and glass-plastics (paragraph 2.5. of this Regulation) shall be considered satisfactory from the point of view of the fire-resistance test if the burn rate does not exceed 90 mm/min.
10.9.2 Rigid plastic panes (paragraph 2.6.1. of this Regulation), flexible plastic panes (paragraph 2.6.2. of this Regulation) and rigid plastic double glazed units shall be considered satisfactory from the point of view of the fire resistance test if the burn rate does not exceed 110 mm/min.
11. Test of resistance to chemicals
11.1. Chemicals used for the test
11.1.1. Non-abrasive soap solution: 1 per cent by weight of potassium oleate in deionised water;
11.1.2. Window-cleaning-solution: an aqueous solution