توضیحات :
NFPA 270 – Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber
۲۰۱۳ Edition
Chapter 1 Administration
۱-۱ Scope.
۱-۱-۱ This shall be a fire-test-response standard.
۱-۱-۲ This test method shall provide a means of measuring smoke obscuration resulting from subjecting essentially flat materials, products, or assemblies (including surface finishes) not exceeding 25 mm in thickness to specified levels of thermal irradiance from a conical heater, in a single closed chamber, in the absence or presence of a pilot flame, and when placed in a horizontal orientation.
۱-۱-۳ The principal fire-test-response characteristic obtained from this test method shall be the specific optical density of smoke from the specimens tested, which is obtained as a function of time, for a period of 10 minutes.
۱-۱-۴ Other fire-test-response characteristics shall also be permitted to be determined.
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