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12-7A-4.8.3 Conduct of Tests
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- Number of tests. Conduct the test on three replicate assemblies.
- Moisture content. Measure the moisture content of the wooden members of the assembly using a moisture meter (ASTM D4444).
- Procedure. Adhere to ASTM E108 "Standard Test Methods for Fire Tests of Roof Coverings" (burning brand test, "A" brand), with apparatus modified as described above in "Test system preparation" and the following procedure:
- The air velocity shall be calibrated using the 60-inch (1.5 m) framework spacing, with a smooth noncombustible calibration deck at a 5-inch (127 mm) per 12-inch (305 mm) horizontal incline positioned 60 inches (1.5 m) from the front opening of the wind tunnel. All other measurement details shall be followed as specified in Sections 4.4.2, 4.4.3 and 4.4.4 of ASTM E108. Although ASTM E108 specifies calibration to be conducted with the 33-inch (840-mm) framework spacing used for the intermittent flame test set up, tests have shown that at the nominal 12 mph setting, there was not difference in measured velocity between the 33- and 60-inch (838 mm and 1524 mm) framework spacing.
- Mount the test specimen at a zero horizontal incline positioned 60 inches (1.5 m) from the front opening of the wind tunnel.
- Ignite the "A" brands as specified in Section 9.4 of ASTM E108 as reprinted here:
- Each 12- × 12-inch (300 × 300 mm) face for 30 seconds.
- Each 2.25- × 12-inch (57 × 300 mm) edge for 45 seconds.
- Each 12- × 12-inch (300 × 300 mm) face again for 30 seconds.
- Center the burning brand laterally on the deck with the front edge 2.5 inches (64 mm) from the entering air edge of the deck.
- Continue the exposure for a 40-minute period or until all combustion of the deck boards ceases. The test shall be terminated immediately if flaming combustion accelerates uncontrollably (runaway combustion) or structural failure of any deck board occurs.
Heat Release Rate is not monitored because of the impracticability with the specified airflow. - Observations. Note physical changes of the deck boards during the test, including deformation from the horizontal plane, location of flaming and glowing combustion, and loss of material (i.e., flaming drops of particles falling from the deck). It is desirable to capture the entire test with a video recorder to allow review of the details of performance.
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