NFPA 271 使用氧气消耗热量计测定材料和产品的热和可见烟释放速率试验标准方法
日期:2012-02-10 14:51
1.1.3* This test method tests the specimen in the horizontal orientation.
A.1.1.3 Testing of materials in the horizontal orientation is preferred, especially for regulatory purposes, because such testing is much more reproducible and repeatable than testing performed in the vertical orientation and generally appears to provide a more severe exposure condition. When vertical orientation is used, it is more difficult to control the pyrolysates that evolve from the materials surface for the purp
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