Flame retardant fabric thermal protective clothing testing American standard NFPA2112 requirements
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American standard NFPA2112 for flame retardant fabric thermal protective clothing. Flame retardant protective clothing
NFPA 2112 is the standard for industrial flame-retardant protective clothing and is the test basis for the establishment of future laws and regulations on industrial flame-retardant protective clothing. It comprehensively elaborates on the thermal protection performance requirements for industrial flame-retardant protective clothing, including a series of thermal protection performance tests.
(1) Vertical combustion performance test. Expose the material to a standard flame for 12 s. After the flame is removed, determine whether it will be ignited and the length of burning damage, etc.
(2) Thermal radiation and thermal convection mixed effect protective performance test, referred to as TPP method. This method is tested by placing a 6-inch square piece of cloth under a convection and radiant heat source with a total energy density of 2 cal/(cm2/s), and then recording the time required to achieve second-degree burns. The TPP value is the time multiplied by As a value of cal/cal/(cm2/s). The higher the TPP value, the greater the protection provided by the fabric. Different from the vertical burning test, the TPP test can tell us how much energy must be absorbed by the simulated human skin to achieve second-degree burns through various different fabrics. In other words, the higher the TPP value, the better the fabric will be when exposed to high temperatures and high-heat flames. The better the protection of the body, the unit TPP value is a more direct reflection of the thermal protection performance.
(3) Thermal human body model test. The experiment involved putting a 6-inch-tall mannequin with 122 temperature testers on its body into fire-resistant clothing and exposing it to a 2 cal/cm2·s heat source assembled from 12 propane flamethrowers. The data collected by a temperature tester simulates the degree and location of second- and third-degree burns that human skin may suffer. This is the most advanced life-size thermal burn assessment system in the world today. In order to further simulate the extent of human burns in actual flames, it is used to test the degree of protection that the entire set of clothing can provide under simulated actual flame conditions. This test allows us to predict the degree of second- or third-degree burns the body is likely to experience. The lower the degree of burns to the body, the greater the chance of survival.
(4) The thermal stability test is basically the same as the 500 °F oven test in the NFPA 1975 standard.
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