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NFPA (Fire) 270
M00015749
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NFPA (Fire) 270 Standard Test Method Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, 2002 edition
standard by National Fire Protection Association, 04/30/2002
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NFPA 270 provides a means of measuring smoke obscuration of essentially flat materials, products, or assemblies (including surface finishes) up to 25mm thick, when exposed to specified levels of thermal irradiance in a single closed chamber. This test method is based on ISO 5659-2, Determination of Specific Optical Density by a Single-Chamber Test, and provides equivalent results to ISO 5659-2.The principal fire-test-response characteristic obtained from using NFPA 270 is the specific optical density of smoke from the specimens tested. An optional fire-test-response characteristic measurable with this method is the mass optical density, which is the specific optical density of smoke divided by the mass lost by the specimens during the test.