Non woven flame retardant is a popular new product on the market now, so how should non-woven fabric be tested! What about the flame retardant performance? The testing methods for the flame retardant properties of materials can be divided into three categories based on the size of the specimens: laboratory testing, medium scale testing, and large-scale testing. However, the first two categories are commonly used based on some flame retardant parameters of the tested materials. The flame retardant performance testing methods can be divided into the following categories.
Ignitivity
The ignition of ignition and combustible test materials is related to a series of factors such as the heat provided by the ignition source, the amount of oxygen available, and the time of application of the ignition source. The ignition source can be chemical thermal energy, electrical thermal energy, or mechanical thermal energy. Ignite test face can verify whether the material is easily ignited by convection or radiation heat or by flames. By using appropriate experimental methods, it is possible to simulate the tendency of materials to ignite at different stages during the initial ignition to flash ignition process, thereby determining whether the material will ignite under low-intensity ignition sources (without radiation heat sources)! Can a small fire develop into a flash fire when starting a fire and under high-intensity radiation heat.
Flame propagation
The flame propagation test refers to the development of flame energy along the surface of a material, and the key factor determining it is the production of flammable gases on the surface of the material, or the formation of flammable gases inside the material that can escape to the surface of the material. The ignitability of the material is also directly related to flame propagation. The surface of insulating materials can be ignited faster, and it has a higher flame propagation rate. The flame propagation rate is the reading rate of the flame front development under certain combustion conditions. The higher the flame propagation rate, the easier it is to spread the fire to nearby objects and expand the fire. Sometimes, the materials that spread flames themselves have low fire hazard, but the damage caused by the materials that can be affected by the fire is very serious.
Heat release
The total heat released during the combustion of a substance in a heat release test is called the total heat released, and the heat released per unit mass (or body) per unit time is called the heat release rate. Both the total heat released and the heat release rate can be expressed in units of heat flux intensity, but the units are different depending on the method used. The heat release rate at different stages of the substance’s combustion is originally variable: the constant heat release rate and the average heat release rate. The heat release rate affects the temperature of the fire environment and the rate of fire propagation, and is one of the decisive factors for the potential fire hazard of the material. The greater the heat release, the easier and faster it is to reach flash fire, and the higher and lower the degree of fire hazard.
Secondary fire effect
Smoke generation test Smoke generation is one of the serious risk factors in fires, as high visibility allows people to evacuate from the building and helps firefighters locate the fire and extinguish it in a timely manner, while smoke greatly reduces visibility and is calming. Smoke generation is often expressed in terms of smoke density or optical density. Smoke density characterizes the degree of obstruction of light and vision by smoke generated by material decomposition or makeup under given conditions. The smoke generation of materials is different from that of open flames. The higher the smoke density and the faster the smoke density increases, the more time it can be used to determine the amount of smoke produced. According to our established principles, the methods for determining smoke production can be divided into two categories: dry optical methods, which measure smoke density, and mass methods, which measure smoke mass. Smoke measurement can be carried out statically or dynamically.
When the toxic components of combustion products and organic materials are decomposed and tested for their grounding properties in fire, various gases with grounding properties can be generated. For example, when the decomposition depth of organic compounds is deep, they can release oxygen compounds, which can form sub acidic and acidic compounds. Phosphorus compounds can release phosphorus dichalcogenides, which can then form terminal acids and other phosphorus containing acid compounds. The corrosive gases generated in fire can corrode various materials, causing equipment (especially electronic and electrical equipment) to malfunction. Especially, the concentration of corrosive gases generated in fire is very high, which can exacerbate the oxidation rate of exposed surfaces of materials or products, resulting in oxidation corrosion on the surface.
Characteristics and applications of flame-retardant non-woven fabric
Flame retardant non-woven fabric is a type of non-woven fabric material with flame retardant properties. Flame retardant non-woven fabric not only has excellent insulation, waterproofing, wear resistance, pollution resistance, and comfort, but also features lightweight, high strength, and corrosion resistance, with broad application prospects. Flame retardant non-woven fabric is widely used in fields such as construction, automobiles, aviation, and ships. Its excellent flame retardant performance is attributed to its special fiber structure and flame retardant treatment. But the production cost is high, so it is necessary to optimize technology and reduce costs, while strengthening the formulation of relevant regulations and standards.
Dongguan Liansheng Non woven Technology Co., Ltd. was established in May 2020. It is a large-scale non-woven fabric production enterprise integrating research and development, production, and sales. It can produce various colors of PP spunbond non-woven fabrics with a width of less than 3.2 meters from 9 grams to 300 grams.
Post time: Aug-23-2024