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SIG plc — is an international supplier of insulation, roofing, commercial interiors and specialist construction products. In 2007, SIG reported half yearly sales of over £1 billion, and was the highest earning and most profitable company in the Sheffield… … Wikipedia
Asphalt — Note: The terms bitumen and asphalt are mostly interchangeable, except where asphalt is used as an abbreviation for asphalt concrete For other uses, see Asphalt (disambiguation). Natural bitumen from the Dead sea … Wikipedia
Road surface — A road in the process of being resurfaced Road surface (British English) or pavement (American English) is the durable surface material laid down on an area intended to sustain vehicular or foot traffic, such as a road or walkway. In the past… … Wikipedia
Fly ash — Photomicrograph made with a Scanning Electron Microscope (SEM): Fly ash particles at 2,000x magnification Fly ash is one of the residues generated in combustion, and comprises the fine particles that rise with the flue gases. Ash which does not… … Wikipedia
petroleum refining — Introduction conversion of crude oil into useful products. History Distillation of kerosene and naphtha The refining of crude petroleum owes its origin to the successful drilling of the first oil well in Titusville, Pa., in 1859. Prior to… … Universalium

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