NFPA 258烟密度测试_ NFPA258美标烟密度测试

NFPA 258 Recommended practice for determining smoke generation of solid materials.
NFPA 258 固体材料燃烧烟雾释放量测试。此标准与BS6401，ASTM E662，ASTM F814标准类似。

NFPA 258烟密度测试方法
烟密度(Ds)测试方法按照NFPA258进行测试，样品在一个密封的炉内进行测试，辐射热源量为2.5w/cm2 。分别在明火焰及非火焰的条件下进行的光束衰减测试。整个测试20分钟，记录第4分钟，第8分钟，整个20分钟的最大的烟密度值。

NFPA 258烟密度测试相关标准
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1.1.1 This test method provides a procedure for assessing the smoke obscuration caused by the burning of solid materials and assemblies in thicknesses up to and including 1 in. (25.4 mm) where subjected to specific test conditions in a closed chamber. The test is used as a research and development tool only and should not be used as a basis for determining ratings for building codes or other regulatory purposes.

1.1.2 Measurement is made of the attenuation of a light beam by the suspended solid or liquid particles - that is, smoke - that accumulate within a closed chamber. The smoke is due to either nonflaming, pyrolytic decomposition or flaming combustion of a relatively small sample of material. The radiant heat source is an electric furnace. NFPA 270, Standard Test Method for Measurement of Smoke Obscuration Using a Conical Radiant Source in a Single Closed Chamber, has subsequently been developed using an improved-design radiant heat source within the same closed chamber.

1.1.3 Test results are expressed in terms of specific optical density, which is a dimensionless property derived from the measured light transmission and geometric easurements of the chamber and the specimen.

1.1.4 This test is intended to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled conditions. It is not intended to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions.

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