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All fabrics will burn, but some are more combustible than others.
Untreated natural fibers such as cotton, linen and silk burn more readily than wool, which is more difficult to ignite and burns with a low flame velocity.
The weight and weave of the fabric will affect how easily the material will ignite and burn.
Fabrics with a tight weave - wool, modacrylic, 100 percent polyester and those that are flame-retardant treated are good choices. Heavy, tight weave fabrics will burn more slowly than loose weave, light fabrics of the same material. The surface texture of the fabric also affects flammability. Fabrics with long, loose, fluffy pile or "brushed" nap will ignite more readily than fabrics with a hard, tight surface, and in some cases will result in flames flashing across the fabric surface.
Most synthetic fabrics, such as nylon, acrylic or polyester resist ignition. However, once ignited, the fabrics melt. This hot, sticky, melted substance causes localized and extremely severe burns. When natural and synthetic fibers are blended, the hazard may increase because the combination of high rate of burning and fabric melting usually will result in serious burns. In some cases, the hazard may be greater than that of either fabric individually.
Curtains, draperies and other articles in the home can have their burning rates reduced with flame retardants applied through chemical treatment. Such flame-retardant treatment after manufacturing is not recommended for clothing.
The design of clothing also may influence the flammability of the garment. Full, long and loose garments tend to ignite easily and have a higher rate of burning since more material is exposed to the atmosphere than with close-fitting garments.
Flame-retardant materials used in garments require special laundering to maintain the flame-retardant effectiveness. Flame-retardant materials should be washed only with standard detergents. Clothing labels usually provide adequate information about the care of the garment.
Recommended clothing for minimum flammability would be sturdy jeans, tight-fitting jerseys, blouses without frills, jersey pajamas with no ruffled nightgowns, clothes with tight-fitting or short sleeves, clothes made from flame-retardant fabrics, sweaters, shirts and dresses that are not loose, flowing or too big. Clothing made from flame-retardant fabric is recommended especially for the elderly.
In terms of flammability, silk may be the worst with a high burning rate, which may be increased by the dyes and other additives to provide color.
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NEW ORLEANS, Jan. 18, &#; Researchers at the U.S. Department of Agriculture's (USDA) Agricultural Research Service (ARS) bred four cotton lines that can be used to make self-extinguishing textiles when exposed to fire and will reduce the need for flame-retardant chemicals to be embedded in consumer products, according to a recent study published in PLOS ONE.
The cotton lines were developed from cultivated cotton varieties and possessed a novel flame-retardant trait. When exposed to an open flame, the fabric from the new cotton lines self-extinguished whereas regular cotton fabric burned entirely in seconds.
"Use of these lines to develop commercial cultivars creates an opportunity to improve the safety of cotton products while reducing the economic and environmental impacts of chemical flame retardants," said Brian Condon, senior author of the study and retired research leader at the ARS Cotton Chemistry and Utilization Research Unit in New Orleans. "These lines will significantly benefit growers, producers, and consumers."
Cotton typically produces flammable fibers and is treated with chemicals to be flame retardant when used for consumer products like clothing, mattresses, upholstery, and carpet. The new cotton lines were created by a multi-parent breeding approach that resulted in new opportunities for natural genes to interact and develop the unexpected trait of flame retardancy.
During a standard 45° incline flammability test, regular cotton (top) burned instantly when exposed to an open flame. In the same test, the fire-resistant cotton (bottom) self-extinguished when exposed to an open flame. (Video by Doug Hinchliffe)
ARS researchers Johnie Jenkins and Jack C. McCarty, supervisory research geneticists at the ARS Genetics and Sustainable Agriculture Research Unit in Mississippi, bred cotton lines to identify genes that affect agronomic traits such as yield and pest resistance and fiber quality traits such as length, strength, and fineness.
"ARS scientists study every step of cotton production from 'Dirt to Shirt' including genetic diversity, field management practices, fiber quality attributes, and end-use textile characteristics," said Jenkins.
Although all of the parental cotton lines produced flammable fabric, researchers found that flame retardance did not come from a single gene. Instead, they found that multiple genes created a phenotype for fibers with significantly lower heat release capacities. The new cotton lines also possessed the desired agronomic and fiber quality traits, making the lines sought after for breeding and consumer usage.
"We look at fabric quality and chemical finishes that create permanent press, wrinkle-free, and flame-retardant fabrics. Now we have found lines with a novel and natural genetic mechanism for flame retardance," said Condon.
The Agricultural Research Service is the U.S. Department of Agriculture's chief scientific in-house research agency. Daily, ARS focuses on solutions to agricultural problems affecting America. Each dollar invested in U.S. agricultural research results in $20 of economic impact.
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