An object of the present invention is to provide a medicinal composition useful for external application in the treatment of a fungal infection reaching the lower part of a thick keratin layer. The propulsion unit includes a base which forms a part of the hull. The coating provides the fiber end piece with improved mechanical stability and reduced tendency to vibrate, making it possible to make it substantially longer than without the coating. The thermoplastic compositions according to the present invention also have a desirable balance of properties such as workability, impact strength, heat resistance, appearance and the like. At least a portion of the fossil fuels recovered may be directly combusted or extracted using the same process used to provide the pure source of CO2 without the need to first remove CO2, sulfur, other fossil fuels, or other impurities.