Ahlstrom Oyj engages in the development and manufacture of specialty papers and fiber composites. It operates its business through the following segments: Filtration; Building and Energy; Food and Medical; and Other Operations. The Filtration segment produces air and liquid filtration materials for life science and gas turbine. The Building and Energy segment includes fiber-based materials in wall coverings, floorings, boat hulls, windmill blades, and automotive interiors. The Food and Medical segment comprises of tea bags, coffee filters, meat casing, vegetable parchment, other food packaging materials, medical gowns, drapes, face masks, and sterilization wraps. The Other Operations segment covers financial and tax assets and liabilities; net financing cost; taxes; holding and sales companies income; expense; assets and liabilities; and share of result of associated companies. The company was founded by Antti AhlstrÃ¶m in 1851 and is headquartered in Helsinki, Finland.