The combustion test method is mainly used to determine the damaged length, duration of combustion and smouldering time of flame retardant fabrics. The flame retardant fabric of certain size is ignited with the prescribed fire source in the prescribed combustion box, and 12S is used to remove the ignition time and time of the flame retardant fabric after the fire source is removed. After the smoldering is stopped, the damaged length of the flame retardant fabric is measured according to the prescribed method. It is mainly based on ASTM F1358-1995 "standard test method of flame retardant properties of fabric - vertical method" and Chinese GB/T5456-2009 "determination of flame spreading properties in vertical direction specimens of textile combustion performance" and GB 5455-1997 "vertical method of textile combustion performance test". According to the Chinese national standard, the continuous combustion time of flame retardant fabrics is less than 5S, the smoldering time is less than 5S, and the damage length is less than 150mm. According to the relative position of flame retardant fabric sample and flame, it can be divided into vertical method, tilt method and horizontal method.
Horizontal and vertical methods are the most commonly used methods for testing flame retardant fabrics. The principle is that one end of the flame retardant fabric specimen is trapped horizontally or vertically, and the specified gas flame is applied to the free end of the sample. The combustion performance of the flame retardant fabric is evaluated by measuring the linear combustion speed (Horizontal method) and the flame and flameless combustion time (vertical method). The vertical experiment is more intense than the 45 degree direction and horizontal direction.
Vertical method is also divided into vertical damage length method, vertical flame spread property determination method, vertical flame retardant fabric sample easy igniting method and surface combustion performance measurement method. The vertical method can be used to determine the flame retardancy of flame retardant fabrics for clothing, flame retardant fabrics for decorative fabrics, tents and so on. The tilting method is suitable for the interior decorative fire retardant fabric of aircraft, and the horizontal method is suitable for the mat fabric such as carpet.
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