Measurements were made on a series of cotton/polyester blends having different compositions. The results showed that the time to ignition increased as the polyester contents of the fabric were increased. An explanation of this observation is given. Both the orientation of the fabric and the temperature of the furnace environment affect the time-to-ignition values. The time to ignition was found to be longer for the fabric loaded in horizontal position than that loaded in vertical position. This difference was attributed to the effect of the forced convection induced inside the furnace.