April 19, 2002—Agricultural Research Service (ARS), the U.S. Department of Agriculture’s chief scientific research agency, has developed a new flame-retarding treatment for cotton-based carpeting.
Cotton has historically taken a backseat to synthetic fibers as a floor covering material due to burning characteristics that often prevent it from meeting federal standards for surface flammability. Although numerous commercial flame retardants are available for treating cotton, many aren’t cost effective for practical use on all-cotton or cotton/polyester carpeting materials.
ARS chemists Eugene Blanchard and Elena Graves overcame the problem by treating cotton carpeting with nontoxic chemicals called polycarboxylic acids. They chose the chemicals for their low cost, availability, absence of formaldehyde, lack of toxicity and reactivity with cotton fibers to impart flame resistance.
Cotton-based carpeting with a low-density cut pile surface normally burns beyond the allowed range (to within one inch of the hole’s edge). In fact, such burning often chars the sample’s entire surface. On the treated carpeting, however, the flame’s spread is restricted to less than one inch from the ignition point.
Technically, the flame could spread another two inches and the sample would still pass the test, adds Blanchard, who co-published a paper in the January 2002 issue of Textile Research.
Use of the treatment could help U.S. cotton capture a greater share of the carpeting market, which consumes five billion bales of synthetic fibers annually.
A more detailed story on the research appears in the April issue of Agricultural Research magazine.
