ASTM D2863-23 pdf - Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index)

ASTM D2863-23 pdf - Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index)

1.1 This fire-test-response standard outlines a method for determining the minimum concentration of oxygen, expressed as a percentage volume, that is required to support flaming combustion in a flowing mixture of oxygen and nitrogen.

1.2 The test method incorporates three distinct procedures: Procedure A involves surface ignition, Procedure B involves propagating ignition, and Procedure C involves comparing the results with a specified minimum value of the oxygen index.

1.3 The specimens used in this test method are categorized into one of six types (see Table 1).

1.4 This test method is designed to evaluate materials that can be structurally self-supporting, specifically vertical bars or sheets measuring up to 10.5 mm thick. These materials are characterized by an apparent density exceeding 15 kg/m³.

1.5 Additionally, this test method is capable of assessing flexible sheet or film materials while being supported vertically.

1.1 本火灾测试响应标准描述了一种测量氧气的最低浓度的程序，该浓度以体积百分比表示，能够支持在氧气和氮气的流动混合物中发生明火燃烧。

1.2 本测试方法提供三种测试程序。程序A涉及表面点燃，程序B涉及传播点燃，程序C是一种简短的程序，涉及与指定的氧气指数最低值进行比较。

1.3 本测试方法使用的测试样品被准备成六种类型中的一种（见表1）。

1.4 本测试方法适用于测试以垂直条或厚度不超过10.5毫米的板材形式构成的结构自支撑材料。这些材料可以是固体、层压材料或多孔材料，其表观密度大于15 kg/m³。

1.5 本测试方法还提供对垂直支撑的柔性薄膜或薄片材料的测试。