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Rosin is brittle and friable, with a faint pine odor. It is typically a glassy solid, though some rosins will crystallize, especially when brought into solution. [6] The practical melting point is variable, some being semi-fluid at the temperature of boiling water, others melting at 100 to 120 °C (212 to 248 °F).
Resin acid refers to any of several related carboxylic acids found in tree resins. Nearly all resin acids have the same basic skeleton: three fused rings having the empirical formula C 19 H 29 COOH. Resin acids occur in nature as tacky, yellowish gums consisting of several compounds. They are water-insoluble. A common resin acid is abietic acid ...
Pimaric acid is a carboxylic acid that is classified as a resin acid. It is a major component of the rosin obtained from pine trees. [1] [2] When heated above 100 °C, pimaric acid converts to abietic acid, which it usually accompanies in mixtures like rosin. It is soluble in alcohols, acetone, and ethers. The compound is colorless, but almost ...
Turpentine is also used as a source of raw materials in the synthesis of fragrant chemical compounds. Commercially used camphor, linalool, alpha-terpineol, and geraniol are all usually produced from alpha-pinene and beta-pinene, which are two of the chief chemical components of turpentine. These pinenes are separated and purified by distillation.
Related to the terpenes, resin acid is oxidized terpenes. Resin acids dissolve in alkalis to form resin soaps, from which the resin acids are regenerated upon treatment with acids. Examples of resin acids are abietic acid (sylvic acid), C 20 H 30 O 2, plicatic acid contained in cedar, and pimaric acid, C 20 H 30 O 2, a constituent of galipot ...
The term terpene was coined in 1866 by the German chemist August Kekulé to denote all hydrocarbons having the empirical formula C 10 H 16, of which camphene was one. Previously, many hydrocarbons having the empirical formula C 10 H 16 had been called "camphene", but many other hydrocarbons of the same composition had different names.
Many different kinds of resins may be used to create a varnish. Natural resins used for varnish include amber, kauri gum, dammar, copal, rosin (colophony or pine resin), sandarac, balsam, elemi, mastic, and shellac. Varnish may also be created from synthetic resins such as acrylic, alkyd, or polyurethane. A varnish formula might not contain any ...
Pitch produced from petroleum may be called bitumen or asphalt, while plant-derived pitch, a resin, is known as rosin in its solid form. Tar is sometimes used interchangeably with pitch, but generally refers to a more liquid substance derived from coal production, including coal tar, or from plants, as in pine tar. [2]