Tar distillation byproduct used as wood preservative
For other uses, see Creosote (disambiguation).
Wood railroad ties before (right) and after (left) infusion with creosote, being transported by railcar at a facility of the Santa Fe Railroad, in Albuquerque, New Mexico, in March 1943. This U.S. wartime governmental photo reports that "The steaming black ties in the [left of photo]... have just come from the retort where they have been infused with creosote for eight hours." Ties are "made of pine and fir... seasoned for eight months" [as seen in the untreated railcar load at right].[1]
Creosote is a category of carbonaceous chemicals formed by the distillation of various tars and pyrolysis of plant-derived material, such as wood, or fossil fuel. They are typically used as preservatives or antiseptics.[2]
Some creosote types were used historically as a treatment for components of seagoing and outdoor wood structures to prevent rot (e.g., bridgework and railroad ties, see image). Samples may be found commonly inside chimney flues, where the coal or wood burns under variable conditions, producing soot and tarry smoke. Creosotes are the principal chemicals responsible for the stability, scent, and flavor characteristic of smoked meat; the name is derived from Greek κρέας (kreas) 'meat', and σωτήρ (sōtēr) 'preserver'.[3]
The two main kinds recognized in industry are coal-tar creosote and wood-tar creosote. The coal-tar variety, having stronger and more toxic properties, has chiefly been used as a preservative for wood; coal-tar creosote was also formerly used as an escharotic, to burn malignant skin tissue, and in dentistry, to prevent necrosis, before its carcinogenic properties became known.[4][5] The wood-tar variety has been used for meat preservation, ship treatment, and such medical purposes as an anaesthetic, antiseptic, astringent, expectorant, and laxative, though these have mostly been replaced by modern formulations.[citation needed]
Varieties of creosote have also been made from both oil shale and petroleum, and are known as oil-tar creosote when derived from oil tar, and as water-gas-tar creosote when derived from the tar of water gas.[citation needed] Creosote also has been made from pre-coal formations such as lignite, yielding lignite-tar creosote, and peat, yielding peat-tar creosote.[citation needed]
^Cite error: The named reference Delnao was invoked but never defined (see the help page).
^Cite error: The named reference overton7 was invoked but never defined (see the help page).
^Cite error: The named reference schorlemmer152 was invoked but never defined (see the help page).
^"ToxFAQs for Creosote". Toxic Substances Portal. ATSDR - Agency for Toxic Substances and Disease Registry. Retrieved 2023-04-07.
^"Coal Tar and Coal-Tar Pitch". cancer.gov. National Cancer Institute. March 20, 2015. Retrieved 2020-11-24.
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