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