What are The Test of Ameican Standard for The Fireproof Workwear of NFPA2112?
2017-11-04 17:34 | writer: admin
NFPA 2112 is an industrial fireproof workwear
standard, which is the basis for the establishment of the industrial fireproof workwear service legislation.
It comprehensively elaborated the thermal protection performance requirements of industrial fireproof workwear, including a series of thermal protection performance tests:
(1) Vertical combustion performance test.Expose fireproof workwear to standard flame 12s, remove the flame, determine whether it will be ignited and the burn damaged length.
(2) Thermal stability test, basically as the same as the oven test 500 ° F in NFPA 1975 standard.
(3) The test of thermal radiation and thermal convection combined action protection performance is short for the TPP method.Test this method is to a block of 6 square inch of the flame retardant fabric placed on the total energy density of CAL / 2 (cm2 • s) convection and radiation heat source, and then record the time needed for second-degree burns, the TPP value is the time multiplied by CAL/CAL/(cm2 • s) value.The higher the value of TPP, the stronger the protection ability of the fabric.And vertical burning test is different, can tell us the TPP test simulating human skin through a variety of different fabric achieved second-degree burns must absorb energy, that is to say the TPP value is higher, the flame retardant fabrics for exposure to high temperature under high flame body the protective is better, unit TPP value is the most direct embodiment thermal protection performance.
(4) Thermal mannequin test.The experiment is to let the body contains 122 6 inches high temperature tester mannequins in fireproof workwear, and exposing it to 12 collection by propane flame thrower into 2 CAL/cm2 • s heat source, the computer according to the data collected from 122 temperature tester data, simulate the human skin may be the secondary and tertiary burn and parts.This is the most advanced thermal burn assessment system in the world at present.In order to further simulate the degree of human body burn in actual flame, it is used to test the protective degree of fireproof workwear under simulated flame condition.Through this test, we can predict the degree of second-degree or third-degree burns that the body may achieve, and the lower the burn rate, the greater the chance of survival.