Flame-retardant textiles are classified according to their ease of burning
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Flame retardant textiles Oxygen limiting index flame retardant fabrics
Flame-retardant textiles are mainly divided into non-flammable fibers, flame-retardant fibers, flammable fibers and easily dyeable fibers.
Non-combustible fiber (open flame cannot be ignited) – oxygen limiting index greater than 35, glass fiber, metal fiber, asbestos fiber, carbon fiber;
Flame-retardant fiber (can burn or carbonize when exposed to fire, and extinguishes when removed from fire) – oxygen limiting index is greater than 26, chlorine fiber, aramid fiber, modified acrylic fiber;
Combustible fiber (combusts when exposed to fire and continues to burn when removed from fire) – oxygen limiting index is greater than 20, polyester, nylon, silk, wool;
Flammable fibers (burn quickly when exposed to fire and continue burning until burned out) – oxygen limiting index is less than 20, cotton, linen, viscose, acrylic, etc.
Limited oxygen index LOI: refers to the lower oxygen content of the oxygen-nitrogen mixture required to keep the material in a burning state under specified test conditions. concentration.
Test method: Place a sample of a certain size on the sample clamp in the combustion tube, adjust the ratio of oxygen and nitrogen, and ignite the test with a specific igniter. In this way, let it burn for a certain time (2 minutes) to self-extinguish or self-extinguish when the damage length reaches a certain value (40mm), and calculate the LOI index from the oxygen\nitrogen flow rate at this time.
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