FR overalls in fact is welding protective clothing like we usually say. Fr clothing can be divided into Permanent flame retardant overalls and durability fire-retardant clothing, fabric of permanent flame retardant overalls refer to yarn or filament already have fire-retardant properties, high washing performance. While the after-treated flame retardant overalls refers to fabric have no fire-retardant properties, treatment after weaving the fabric use yarn or filament, washable performance of treated flame retardant fabric is relatively low. So What are permanent flame retardant fabric?
Common fiber of Permanent fr clothing and features:
(1) Nomex fiber: heat retardant fiber (scientific name: meta-aramid fiber, aramid 1313);
Nomex fiber Features:
1, heat-resistant permanent flame retardant fiber, high strength, high wear resistance, low shrinkage, chemical structure and stability, acid and alkali resistant and prevent corrosion of organic chemicals ,etc.
2, good dimensional stability, its heat shrinkage rate was only 1% after long-term use at 250 ℃ , fire does not melt, no droplet, does not produce toxic gases;
3, over 400 ℃ began to decompose, the surface of cloth began thickening when decomposition , at a temperature of 900 ℃ -1500 ℃ of heat transfer can be isolated without cracking. FR clothing produced by Nomex fiber, light weight, elastic, breathable, soft and comfortable to wear;
4, due to the outstanding performance of the fabric is from the fiber itself, not auxiliaries,so it can be any washing, but its function will not change;
5, the fibers are added Kevlar bulletproof fiber which increases the breaking strength and tear strength of the fabric. Nylon fiber with added carbon fiber core, so that the fabric has a permanent anti-static function;
6, Nomex after oil water repellent finishing so that the fabric has a performance of water and oil repellent, stain-release and so on.
(2) Kevlar fiber: High-density low elongation bulletproof fiber (scientific name: para-aramid fiber, Kevlar, domestic known as aramid 1414);
Kevlar fiber Features:
1, Kevlar (Kevlar) has a very good thermal stability, Fire Resistance, chemical resistance, insulation resistance, and high strength and modulus, the physical properties of Kevlar and other fibers to make a comparison, Kevlar fiber is asbestos 2-11 times the intensity is 1.6 times the strength of high-strength graphite, three times the strength of the glass fiber, the same weight of steel fiber is five times the strength. And Kevlar density is very low, almost half the density of asbestos;
2, thermal stability, Kevlar hot test (TGA) is very stable until 600 ℃ have a significant weight loss;
3, low aggressive, having a high content of the test strip Kevlar, exhibits less than half of the metal sheet erosion;
4, wear resistance, compared with asbestos fibers, Kevlar fibers in good condition to reflect the very low abrasion resistance.
Therefore, the above-mentioned flame-retardant clothing made of fabric widely used in petroleum, petrochemical, chemical, power and other industries, particularly favored by foreign labor protection department.