Porvair plc, a filtration and environmental technology company, designs, develops, and sells specialist filtration and separation equipment. It operates in three segments: Aerospace & Industrial, Laboratory, and Metal Melt Quality. The Aerospace & Industrial segment designs and manufactures a range of specialist filtration equipment for applications in aerospace, energy, and industrial applications. The Laboratory segment designs and manufactures instruments and consumables for use in environmental and bioscience laboratories with a focus on water analysis instruments and sample preparation equipment. This segment also produces a range of laboratory microplates, tubing, and associated consumables for use in sample preparation and chromatography applications; and water analysis equipment. The Metal Melt Quality segment designs and manufactures porous ceramic filters for the filtration of molten metals. It provides patent protected filters for the aluminum cast house industry; and the filtration of gray and ductile iron, as well as filtration of super alloy filters used in the manufacture of turbine blades. The company is also involved in trading activities. It operates in the United Kingdom, Continental Europe, the United States, South America, Asia, and Africa, as well as other NAFTA countries. The company was incorporated in 1982 and is headquartered in King's Lynn, the United Kingdom.