Polyketones, also know as Carilon, Karilon, Akrotek, and Schulaketon, are a family of high-performance thermoplastic polymers. Polyketone is polymerized from an acetyl group and a propionyl group. The polar ketone groups in the polymer backbone of these materials gives rise to a strong attraction between polymer chains, which increases the material's melting point (255 °C for copolymer (carbon monoxide ethylene), 220 °C for terpolymer (carbon monoxide, ethylene, propylene). Such materials also tend to resist solvents and have good mechanical properties. In industry, they can be used as antibiotics, antifungals, or natural insecticides.