Flame retardant wool using zirconium oxychloride in various acidic media optimized by RSM

► We investigate effect of ZrOCl2 and HCl on the flame retardancy of wool fabric. ► The response surface methodology uses for the experimental plan with. ► The thermal degradation studies by thermal analysis, LOI and vertical flame test. ► The fabric surfaces observe by SEM. ► Results show an increase in the decomposition temperature, residual mass and LOI.