NFPA 2112 is a standard for industrial flame-retardant protective clothing and is the test basis for future industrial flame-retardant protective clothing laws and regulations. It comprehensively describes the thermal protection performance requirements of 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 removing the flame, determine whether it will be ignited and burned to damage the length.
(2) The thermal stability test is basically the same as the oven test in the NFPA 1975 standard.
(3) Thermal radiation and thermal convection protection performance test, referred to as TPP method. The method test is to place a 6-square-inch cloth under a thermal convection and radiant heat source with a total energy density, and then record the time required to reach the secondary burn. The TPP value is the value multiplied by the time. The higher the TPP value, the stronger the protection provided by the fabric. Different from the vertical burning test, the TPP test can tell us how much energy the simulated human skin needs to absorb to achieve secondary burns through various different fabrics. That is to say, the higher the TPP value, the higher the fabric's resistance to exposure to high temperature and high heat The better the body's protection, the unit TPP value is a more direct manifestation of thermal protection performance. (4) Thermal human body model test. The test involves putting a 6-inch mannequin with 122 temperature testers on its entire body in fireproof clothing and exposing it to a heat source formed by a 12-propane flamethrower. The computer collects data from 122 temperature testers. The data of, simulate the degree and location of secondary and tertiary burns that human skin may suffer. This is the most advanced thermal burn assessment system in the world with the same size as a human being. In order to further simulate the burn degree of the human body in the actual flame, it is used to test the degree of protection that the whole set of clothes can provide under the simulated actual flame condition. Through this test, we can predict the degree of secondary or tertiary burn that the body may achieve. The lower the body burn, the greater the chance of survival.
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