Comparison of thermal protection performance testing methods for thermal protective clothing at home and abroad
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Thermal protective clothing thermal protection performance safety protection flame retardant performance
Thermal protective clothing refers to various types of protection for the human body working under high temperature conditions, thereby preventing the human body from being harmed by high temperature Sexual clothing. Thermal protective clothing not only has the wearing performance of ordinary protective clothing, but also must have the function of safely protecting the human body under high temperature conditions. The thermal protection performance of thermal protective clothing depends on the use occasion and environment of the thermal protective clothing. Because under different conditions of use, heat sources that can cause harm to the human body come in many forms, such as flames, contact heat, radiant heat, sparks and molten metal jets, high-temperature gases and hot vapors, and high heat generated by arcs. The requirements for thermal protection performance are also different. At the same time, thermal protection performance is also related to the way heat is transferred from the heat source. Usually, the methods of heat transfer include thermal convection, heat transfer, thermal radiation, and a combination of two or three of the above methods. Therefore, in the actual application of thermal protective clothing, thermal protective clothing should have different thermal protection properties for different purposes and environments. But in general, thermal protective clothing must have thermal protective properties such as flame retardancy, thermal insulation, integrity and resistance to liquid penetration.
The thermal protection performance of thermal protective clothing can be tested and evaluated through certain test methods. Extensive research has been carried out in this area at home and abroad, and formulations have been formulated. Corresponding test methods and standards have been established.
The research on domestic thermal protection performance testing methods of thermal protective clothing focused on the testing and evaluation of the flame retardant performance of thermal protective clothing in the early stage. At present, my country has established relatively complete fabric flame retardant performance testing methods and standards, including vertical method, horizontal method, oxygen index method, 45° tilt method, smoke concentration method, etc. In the flame retardant performance test of thermal protective clothing, my country draws on similar foreign standards and adopts the vertical method for testing and evaluation, that is, measuring indicators such as fabric afterburning time, smoldering time and damage length. At the same time, our country has also formulated the national standard “Determination of Thermal Protection Properties and Molten Metal Impact Resistance of Thermal Protective Fabrics”. In the Ministry of Public Security’s “Performance Requirements and Test Methods for Firefighters’ Ordinary Protective Clothing Insulation Clothing” industry standard, a test method for the radiation heat penetration resistance of protective clothing was formulated.
Compared with China, Western developed countries such as the United States and Europe have conducted research and development on thermal protective clothing earlier, and have now formulated and implemented a series of advanced and Complete product standards and test method standards for thermal protective clothing. In the testing research of thermal protection performance, in addition to formulating and establishing a relatively complete test method for evaluating flame retardant performance, various testing standards for other aspects of thermal protection performance have also been established, such as the thermal insulation integrity of thermal protective clothing. and liquid permeability resistance, etc., as well as the TPP method Thermoman method that reflects comprehensive thermal protection performance. Through these methods, the thermal protection performance of thermal protective clothing can be more comprehensively tested and evaluated. Nowadays, the test methods developed by ASTM (American Society for Testing and Materials), NFPA (National Fire Protection Association), and EN (European Union) are commonly used internationally. Such as ASTM D4108 (TPP open flame test method for thermal performance of clothing materials), ASTM F0955 (Method for determination of heat transferred through protective materials when protective clothing contacts molten objects), NFPA1971 (Standard for multi-layer firefighting clothing), NFPA 1976 (Firefighting near fire) Standard for Protective Clothing for Firefighters), NFPA 1977 (Standard for Protective Clothing and Equipment for Wildland Firefighters), EN 469 (Standard for Protective Clothing for Firefighters) EN 366 (Test Method for Radiation Protection Performance of Protective Clothing), EN 367 (Protective Clothing Exposed to Flame Convection heat transfer performance test method), EN 368 (Protective clothing resistance to liquid penetration performance test method), etc.
A comparative analysis of the thermal protection performance testing methods of thermal protective clothing at home and abroad, it can be found that in addition to having established relatively complete flame retardant performance testing standards, our country has also Standards for testing methods for other thermal protection properties of protective clothing should also be established as soon as possible, and performance indicators of other thermal protection performance and wearing comfort should be added to the performance requirements of thermal protective clothing, and the thermal protection performance testing system and thermal protection performance testing system should be continuously developed and improved. Protective clothing standards promote the development of my country’s thermal protective clothing market.
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