ASTM D 3874：用电热丝法测量材料引燃的测试方法
ASTM D 3874：Standard Test Method for Ignition of Materials by Hot Wire Sources
Abstract 摘要
During operation of electrical equipment, including wires, resistors, and other conductors, it is possible for overheating to occur, under certain conditions of operation, or when malfunctions occur. When this happens, a possible result is ignition of the insulation material. This test method assesses the relative resistance of electrical insulating materials to ignition by the effect of hot wire sources. This test method determines the average time, in seconds, required for material specimens to ignite under the specified conditions of test.
This method is suitable to characterize materials, subject to the appropriate limitations of an expected precision of ±15 %, to categorize
materials.In this procedure the specimens are subjected to one or more specific sets of laboratory conditions. If different test conditions are substituted or the end-use conditions are changed, it is not always possible by or from this test to predict changes in the fire-test-response characteristics measured. Therefore, the results are valid only for the fire test exposure conditions described in this procedure.
materials.In this procedure the specimens are subjected to one or more specific sets of laboratory conditions. If different test conditions are substituted or the end-use conditions are changed, it is not always possible by or from this test to predict changes in the fire-test-response characteristics measured. Therefore, the results are valid only for the fire test exposure conditions described in this procedure.
