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Do flame retardant materials really not burn?
The three elements of combustion are known to most people, that is, the combustible material, the combustion-supporting material such as oxygen, and the temperature to reach the ignition point. As long as these three elements are present, combustion will occur. The same is true for flame-retardant materials or products. If these three conditions are met, they will burn. Since flame retardant materials or products will also burn, what's the point of being flame retardant? The answer is yes, flame retardant still has a role, and can play a corresponding role in preventing and delaying when danger occurs. What exactly is flame retardant? Its English standard translation name: flameretardance, refers to the property that the material has or that the material has after processing to obviously delay the spread of flame. Flame retardant is actually not easy to burn or will extinguish itself after leaving the fire, not non-combustible. The purpose of using flame retardant materials is to prevent or delay combustion. When a fire occurs, the material is not easy to be burned, and the scope of combustion will not be aggravated or expanded. In order to find hidden dangers as soon as possible and save valuable time in time. Flame retardant is also graded. Most of the unmodified plastic materials have poor flame retardant properties and are easy to burn. By adding corresponding flame retardants for modification, the flame retardant properties of the materials are improved and become less flammable, which meets the requirements of the corresponding standards. Different countries have different grades and classifications, and have corresponding scientific testing standards and methods. At present, there are many methods for evaluating flame retardancy, such as oxygen index measurement method, horizontal or vertical combustion test method, etc. For example, China's national standard GB/T5169.11-2006 'Fire Hazard Test for Electrical and Electronic Products Part 11: Glow Wire/Basic Test Method for Glow Wire Flammability Test Methods for Finished Products' (IEC60695-2-10:2000, IDT ), the flame retardant test of the product is specified and described in detail. The flame retardant grade of the product also has 650 ℃, 750 ℃, 850 ℃ and other grades. Another flame retardant standard that is widely used in the field of electrical and electronic products is UL94, which has global influence. Standard splines, standard flames, and standard combustion methods are required for flame retardant testing. The flame retardant grades also include HB, V2, V1, V0 and other levels. In the flame retardant test of UL94, for the fuel that produces the flame, the height, angle and burning time of the flame from the test material spline are specified in detail, and the size of the spline is also standard, so that the test results can be guaranteed. reliability, stability and accuracy. It is obviously unscientific to use ordinary lighters to ignite corresponding products and test their flame retardancy. First of all, different substances have different heats of combustion. What is the heat of combustion? The heat of combustion (ΔcH0) refers to the heat released when a substance and oxygen undergo a combustion reaction. It is generally measured by the amount of energy per unit substance, unit mass or unit volume of fuel when it is burned. At 25°C and 101kPa, the heat released when 1mol of combustibles is completely burned to form stable oxides is called the heat of combustion of the substance. The unit is kJ/mol. It can also be measured in units of megajoules/kg. There are many types of lighters, and all the fuels are not the same. Therefore, the flame temperature produced by different types of lighters is very different, and the accuracy range specified by the standard test cannot be reached at all, and the test results are of course unconvincing. In addition, when testing with a lighter, the time, position, and angle of the flame contacting the test product are arbitrary. In such a test, if the sample is ignited, it does not mean that it is unqualified. Burning level. Therefore, such a test does not explain the problem at all. Using a lighter for flame retardant test is not only meaningless, on the contrary, it will cause the danger of burns and fire. Therefore, consumers must not use such methods to test, and do not believe such tests. It is recommended to choose branded products when purchasing, or ask the merchant to provide the corresponding professional test report. More about Flammability Testers: http://www.standard-groups.com/FlammabilityTesting/4.html
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1. ISO 5402-1: Specifies the flexometer method for testing leather flex resistance under repeated bending.
2. ISO 17694: Defines test methods for footwear upper and lining flex resistance, simulating real-world bending stress to assess long-term durability.
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