The material spread of flame along the surface of a product orientated in a vertical plane, is determined by this test method using the apparatus shown below.
材料的火焰沿着在定位在垂直面上的产品的表面传播，是由使用以下的实验装置的测试方法所确定的。
The material spread of flame along the surface of a product orientated in a vertical plane, is determined by this test method using the apparatus shown below.
材料的火焰沿着在定位在垂直面上的产品的表面传播，是由使用以下的实验装置的测试方法所确定的。
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