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  2. Coal tar - Wikipedia

    en.wikipedia.org/wiki/Coal_tar

    Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. [2] [3] It is a type of creosote. It has both medical and ...

  3. Pitch (resin) - Wikipedia

    en.wikipedia.org/wiki/Pitch_(resin)

    Pitch is a viscoelastic polymer which can be natural or manufactured, derived from petroleum, coal tar, [1] or plants. Pitch produced from petroleum may be called bitumen or asphalt , while plant-derived pitch, a resin , is known as rosin in its solid form.

  4. Piling - Wikipedia

    en.wikipedia.org/wiki/Deep_foundation

    They can be easily cut off or joined by welding or mechanical drive-fit splicers. If the pile is driven into a soil with low pH value, then there is a risk of corrosion, coal-tar epoxy or cathodic protection can be applied to slow or eliminate the corrosion process. It is common to allow for an amount of corrosion in design by simply over ...

  5. Tar - Wikipedia

    en.wikipedia.org/wiki/Tar

    One can produce a tar-like substance from corn stalks by heating them in a microwave oven. This process is known as pyrolysis. Tar is a dark brown or black viscous liquid of hydrocarbons and free carbon, obtained from a wide variety of organic materials through destructive distillation. Tar can be produced from coal, wood, petroleum, or peat. [1]

  6. Goeckerman therapy - Wikipedia

    en.wikipedia.org/wiki/Goeckerman_Therapy

    [8] [9] However, Goeckerman therapy is considered safe although use of tar may have the side-effects of contact dermatitis and mild local burning due to tar hypersensitivity. A retrospective study by Stern et al., of 1,373 patients concluded that there was an increase in skin cancers in those receiving repeated Goeckerman treatments compared to ...

  7. Coal gasification - Wikipedia

    en.wikipedia.org/wiki/Coal_gasification

    Coal tar and coal tar sludges are frequently denser than water and are present in the environment as a dense non-aqueous phase liquid. In the UK, a number of former gasworks sites have been redeveloped for residential and other uses (including the Millennium Dome ), being seen as prime developable land within the confines of city boundaries.