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            Flame retardant properties and performance indexes of flame retardant fabrics
            
                    Flame retardant properties and performance indexes of Flame retardant fabrics
            
In order to reduce the burn caused by fire, flame retardant protective clothing is worn by the last line of defense to ensure safety, so the protective performance of flame retardant clothing is very important, especially for comfort, flame retardant, fire shrinkage, only these three indicators at the same time to meet the national standard, in order to better play the role of protection. Flame retardant clothing is one of the most widely used varieties of personal protective equipment, in contact with the flame and hot objects, in a certain period of time, flame retardant jacket can prevent it from being lit, flaming or smouldering, protect workers from fire or heat damage. Therefore, the performance of flame retardant clothing is very important, especially comfort, flame retardant, fire contraction, only the three indicators meet the requirements, in order to better play a protective role.
            
Flame retardant clothing material at present, the market of flame retardant protective clothing with fabric variety, flame retardant cotton, modified flame retardant polyester, aramid series (such as PSA, AN-VDC), but with high quality Flame retardant fabric comfort, flame retardant fire shrink, almost No. Because any kind of fiber is not perfect, each has its advantages and disadvantages. Cotton flame retardant fabric is comfortable, but low strength, low temperature resistance, 180 degrees on carbonation; polysulfonamide, modacrylic fiber, aramid fiber, fire contraction is serious, and this kind of fiber is hygroscopic, poor comfort; high temperature air generator interface para aromatic fire, small shrinkage, but poor comfort; PBO (poly phenylene benzoxazole and two) fiber fire does not shrink, but there is no localization, the price is expensive, and because the polymer fiber moisture absorption performance, comfort is poor. Flame retardant protective clothing is comfortable, flame retardant, high temperature shrinkage is equally important, flame retardant fabric only put the three functions in one, in order to provide better protection for the wear. In order to meet the performance requirements of the three kinds of flame retardant clothing, China has developed enterprise with cellulose flame retardant fiber as the substrate, the skeleton blended into para aramid aramid blended fabric, both flame retardant clothing comfort, flame retardant and thermal fabric inspection items
            
Standard requirements for measured results
            
Thermal protection factor TPPkW. S/m2
            
Grade: Grade a washing times: 50 times
            
Direct skin contact with more than 126 skin and clothing have a space between more than 250
            
938 continued burning time (s) grade index washing times by weft direction
            
A 0.00.0B = 2s50 level C = 5s12 (s) a smoldering time less than 2s50 times
            
0.91.0B C = 5s12 damage length (mm)
            
A less than or equal to 5050 times 4746 = 100
            
C level less than or equal to 15012 times the combustion characteristics of no droplet, dripping
            
Test results of flame retardancy of 1 aramid blended fabric 101 labor protection LabourProtection shrinkage. Aramid blended flame retardant clothing comfort in production and life, the fire was accidental, it can be said flame retardant clothing is the idea that day, one day the protective clothing, so the flame retardant clothes have a certain air permeability and moisture permeability, to ensure that the wearing of flame retardant protective clothing comfort. If wearing a flame retardant clothing gives people a strong sense of discomfort, the wearer will not want to wear, which will lose the meaning of protection. Even if it's not absolutely uncomfortable, it can also affect work efficiency. Therefore, the comfort of flame retardant clothing is very necessary. Hygroscopicity and moisture permeability of cellulose and flame retardant fiber is better, which reflects the transfer resistance of resistance in the fabric of water vapor (Ret), water vapor transfer resistance resistance of fabric is small, breathable fabric is better, is conducive to improve the flame retardant clothing comfort. EN469 requirements and test methods for fire protection clothing for fire protection personnel indicate that water vapor transfer hinders the performance index below 30. This is the EU standards, the main consideration is the large fire, protected against heat and flame, not including removal of spillover chemicals, forest fires, fire fighting, use close road accident rescue and other special tasks or special fire protection clothing. The shapes of various fabrics were compared before and after combustion in the flame at 700~800 degrees centigrade. 1022 the thermal shrinkage of each fabric in the flame at 700~800 degrees (900cm2 of each sample area), the product name of the serial number, the area after combustion (CM
            
2) heat shrinkage rate (%) 1100% para aramid (twill) 882.051.99
            
2 para aramid / carbon based fiber (twill) 870.253.31
            
3 para aramid / fire-retardant Modaier (plain) 870.213.31
            
4100% polyimide fiber 858.424.62
            
5 para aramid / flame retardant cotton (plain weave) 817.879.13
            
6 cotton flame retardant fabric (twill) 649.2527.86
            
7 flame retardant modacrylic cotton (plain) 423538 III A fabric (twill) 416.1553.76
            
9100% aramid (twill) 300.866.5810 aramid (twill) blended ratio of 23174.33 water vapor transfer hinder performance depends on the cellulose of the flame retardant fiber, flame retardant cellulose fiber content is large, the water vapor transfer barrier is small, flame retardant protective clothing comfort stronger. It is found that when the content of cellulose flame retardant fiber is more than 50%, the Ret value is lower than 30. The moisture permeability of the fabric can reach more than 6000g/m2. 24h, according to different requirements, with anti-static fiber or other functional fibers, it can have breathable, moisture absorption, regulating the function of human heat. Flame retardant aramid blended flame retardant clothing either material fabric, flame retardant properties of flame retardant clothing must meet GB8965.1-2009 "flame retardant protective protective clothing - part first: flame retardant clothing" requirements, in the event of a fire, can protect the wearer from. Based on cellulose flame retardant fiber, aramid fiber blended fabric with para aramid fiber as skeleton, after special processing, it can ensure comfort and ensure permanent resistance
            
                  
            

                    
                
            

                
        
            

        
        
            
            

            
           
            

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