The effect of ammonium chloride as a nondurable finish on the flammability of 100% polyester fabric has been investigated. The laundered, bone-dried, weighed fabrics were impregnated with a suitable concentration of aqueous ammonium chloride solution by means of squeeze rolls and drying at 110 C for 30 min. They were then cooled in a desiccator, re-weighed in an analytical balance and kept under ordinary conditions before the fulfillment of the vertical flame spread test. The optimum add-ons to impart flame retardancy were about 20.21-21.87 g anhydrous ammonium chloride per 100 g fabric. These results comply with the Free Radical Theory. Finally, the Mohr analytical test method was used to detect the salt content in finished fabrics.
The comparative effects of three selected phosphates on the flame retardancy of pure cotton and polyester fabrics have been chosen from the author's previous investigations. Earlier described procedure for the evaluation of flame retardancy were used. The optimum loading required to achieve flame retardancy indicated the inferiority of sodium polymetaphosphate as compared with the others.
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