Firefighters often encounter high-temperature disasters such as flames, high-temperature gas or molten metal during fire fighting. Fire-fighting clothing has the function of flame-retardant and heat insulation, which can protect the human body from external high heat and reduce skin burns.
For firefighters who work near the fire site for a long time, the heat insulation effect of firefighting clothing is very important. The heat transfer performance of fire-fighting clothing is evaluated based on the skin burn caused by the total energy transferred from the external environment to the skin through the clothing and the air layer under the clothing. Therefore, the type of clothing material and the distribution of the air layer under the clothing have a significant effect on the thermal protection performance of the fire-fighting clothing. Significant influence.
For the heat transfer performance test of clothing materials, relatively complete international standards have been formed, such as ASTM F2700-2008 “Testing the heat transfer performance of flame-retardant fabrics under unsteady heat exposure conditions”, ASTM F1939-2015 “Testing flame-retardant clothing Radiant thermal resistance of fabrics under radiant heat exposure”, ASTM F2731-2011 “Testing the heat transfer and heat accumulation performance of fire-fighting clothing”, etc. However, the above standards and test methods are necessary for the fabrics between layers and between the fabric and the sensor. There is no uniform requirement for increasing the air layer. Since the air layer under the clothing can hinder the heat transfer between the clothing and the skin and affect the thermal resistance of the clothing, the effect of the air layer under the clothing and its influence on the thermal protection performance of fire fighting clothing is studied, which is a comprehensive evaluation and improvement of the thermal protection of fire fighting clothing. Performance is important.