Abstract
The fiammability of cotton fabrics dyed with indigo and bromine- and/or chlorine-substiluted indigo dyestuffs was studied by the oxygen index technique and thermogravimetric analysis. The palest shades of dye on the fabric decreased the oxygen index values below that of the untreated control, whereas higher add-on of dye slightly elevated the oxygen index values. Bromine substitution gave the highest oxygen index values, although those for most of the dyeings with halogen-substituted indigoids fell within the range of values for fabrics dyed with pure indigo. However, the presence of bromine in the dyestuff consistently altered the path of thermal degradation of dyed fabrics from that of the untreated control and the indigo-dyed fabric.
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