易燃液体危险品闭杯闪点与持续燃烧试验探讨

闭杯闪点是评估液体易燃危险性的重要指标之一，持续燃烧试验则用于测定物质在试验条件下加热并暴露于火焰时是否持续燃烧，通过实验探究不同测试标准下易燃液体危险品闭杯闪点低于35 ℃、55 ℃≤闭杯闪点＜63 ℃的特点及其持续燃烧情况。结果表明：存在闭杯闪点低于35 ℃但被定为不持续燃烧的液体，首次提出能否将此类液体划分为非易燃液体；55 ℃≤闭杯闪点＜63 ℃的液体在某一适合测定方法条件下闭杯闪点低于60 ℃且被测定为持续燃烧的液体，建议划分为易燃液体。此探讨将为研究易燃液体危险性评估及分类提供参考。

Study on closed-cup flash point and sustained combustibility test of flammable dangerous liquids

Closed-cup flash point is one of the important index to assess the flammable hazard of liquids, and the sustained combustibility test is used to determine if a substance sustains combustion when heated under the test conditions and exposed to a flame. By experiments the features of flammable dangerous liquids with closed-cup flash point below 35 ℃ and 55 ℃≤closed-cup flash point < 63 ℃ under different test standards and their sustained combustibility were explored. The results showed that: when the closed-cup flash point of liquid is below 35 ℃， the substance is essessed as not sustaining combustion,and it is proposed for the first time that the liquids can be classified as non-flammable liquids; The liquid is recommended to be classified as flammable liquid if the closed-cup flash point is 55 ℃≤closed-cup flash point < 63 ℃ and the closed-cup flash point is lower than 60 ℃ with a suitable testing method as well as the substance is essessed as sustaining combustion. This study will provide an important reference for further study on the test methods of risk assessment and classification for flammable liquids。