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The term creosote has a broad range of definitions depending on the origin of the coal tar oil and end-use of the material. With respect to wood preservatives, the United States Environmental Protection Agency (EPA) considers the term creosote to mean a pesticide for use as a wood preservative meeting the American Wood Protection Association (AWPA) Standards P1/P13 and P2. [6]
Apart from structural wood preservation measures, there are a number of different chemical preservatives and processes (also known as timber treatment, lumber treatment or pressure treatment) that can extend the life of wood, timber, and their associated products, including engineered wood. These generally increase the durability and resistance ...
Acetone-Rosin Treatment is sometimes used on dense wood that cannot be penetrated by PEG. [13] This would include softwoods that are nonporous. The goal of this treatment is to replace cells of wood with natural rosin. Rosin is a natural resin that is produced within some woods, for example pines naturally produce resin and are considered a ...
After Henry died in 1928, his company and its competitor, J. M. Colman's creosote company (located in West Seattle), were combined in 1930 to form the West Coast Wood Preserving Company. In 1947, Walter Wyckoff bought out the Colman family's interest and, after joining with J. H. Baxter in 1959, renamed the company the Baxter-Wyckoff Company.
Coal tar creosote; Wood creosote; Reduction product of vanillin using zinc powder in strong hydrochloric acid (Clemmensen reduction) Found as glycosides in green vanilla beans [2] It is also found in tequila. [3]
Chromated copper arsenate (CCA) is a wood preservative containing compounds of chromium, copper, and arsenic, in various proportions.It is used to impregnate timber and other wood products, especially those intended for outdoor use, in order to protect them from attack by microbes and insects.
Creosote derived from coal processing, was discovered in the mid-18th century to prevent timber pile decay. [3] The development of Creosote pressure treatment by John Bethel was also an important advancement in timber piling construction. [3] Historic buildings supported by timber piles may either be treated with creosote or chromated copper ...
According to the National Psoriasis Foundation, coal tar is a valuable, safe and inexpensive treatment option for millions of people with psoriasis and other scalp or skin conditions. [45] According to the FDA , coal tar concentrations between 0.5% and 5% are considered safe [ 46 ] and effective for psoriasis.