Abstract: An improved flexible splice is provided which is useful in joining segments of a substantially flat band (e.g., a flat tow) of an acrylic fibrous material in an end to end relationship. Such acrylic fibrous material subsequent to splicing, is passed through a heated thermal stabilization zone and thereby undergoes an exothermic cyclization reaction of pendant nitrile groups present therein. More specifically a silicone rubber adhesive is applied to the surfaces of the ends of each band segment and thereafter bonded preferably under elevated temperatures and pressure to form a splice through which the exothermic heat of reaction is effectively dissipated to an extent sufficient to avoid a deleterious effect on the original fibrous configuration which might otherwise result in the absence of such dissipation.