Plastic casings are generally made from polymers such as polyamide, polypropylene, or polyethylene. It is mainly used as blend with polystyrene, high impact styrene-butadiene copolymer or polyamide. Dimer acids are used primarily for synthesis of polyamide resins and polyamide hot melt adhesives. Phenoxathiin is used in polyamide and polyimide production. Catgut has partially been replaced by synthetic materials including nylon, polyamide, and other polymers. Nylon 12 has a broad range of applications as polyamide additives. The shirts will be made of 75 percent merino wool and 25 percent polyamide (nylon). Bandages are made up of cotton wool, cellulose, or polyamide materials. Reverse osmosis uses a thin-film composite membrane, which comprises an ultra-thin, aromatic polyamide thin-film. The rifle's stock is made from fibreglass-reinforced polyamide 66. Cold form foil film (or cold-formed foil) is made of a 3-layer laminate&colon; PVC/Aluminum/Polyamide. A fixed synthetic (polyamide) buttstock is also available. Apart from hard polyamide sheath a special Leather sheath is available from Eickhorn. The name is a portmanteau of "aromatic polyamide". There he led the technical preparation of plastics, namely polyamide and caprolactam.