Sunhemp fiber was coated with different compositions of antimony compounds (Sb2O3)-Polyvinyl chloride (PVC) fire retardant solutions. Changes in surfaces, breaking strength and in thermal stability of coated sunhemp fibers were determined. It was observed that the coatings changed the surface and ultimate tensile strength (UTS) of sunhemp fiber. The DSC peak occurred at lower temperatures in the case of coated fibers.