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Resin is a hydrocarbon secretion of many plants, particularly coniferous trees. It is valued for its chemical constituents and uses, such as varnishes and adhesives, as an important source of raw materials for organic synthesis, or for incense and perfume. Fossilized resins are the source of amber. The term is also used for synthetic substances of similar properties. Resins have a very long history and are mentioned by both ancient Greek Theophrastus and ancient Roman Pliny the Elder, especially as the forms known as frankincense and myrrh. They were highly prized substances used for many purposes, especially perfumery and as incense in religious rites. The resin produced by most plants is a viscous liquid, composed mainly of volatile fluid terpenes, with lesser components of dissolved non-volatile solids which make resin thick and sticky. The most common terpenes in resin are the bicyclic terpenes alpha-pinene, beta-pinene, delta-3 carene and sabinene, the monocyclic terpenes limonene and terpinolene, and smaller amounts of the tricyclic sesquiterpenes, longifolene, caryophyllene and delta-cadinene. Some resins also contain a high proportion of resin acids. The individual components of resin can be separated by fractional distillation A few plants produce resins with different compositions, most notably Jeffrey Pine and Gray Pine, the volatile components of which are largely pure n-heptane with little or no terpenes. The exceptional purity of the n-heptane distilled from Jeffrey Pine resin, unmixed with other isomers of heptane, led to its being used as the defining zero point on the octane rating scale of petrol quality. Because heptane is highly flammable, distillation of resins containing it is very dangerous. Some resin distilleries in California exploded because they mistook Jeffrey Pine for the similar but terpene-producing Ponderosa Pine. At the time the two pines were considered to be the same species of pine; they were only classified as separate species in 1853.
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Resin Subcategories
Resin Articles
Manufacturers Selling Resin Wicker Deck Furniture
by Trevor Price
Nov 26, 2008
Just because you're purchasing resin wicker outdoor furniture, doesn't translate to you needing to settle for whatever is on sale at the garden shop or discount department store.
It's possible to find high-quality, well-designed, outdoor wic...
Suppresing Your Appetite While On Atkins
by Jackie Serta
Aug 05, 2008
One of the most common, and surprising, effects of following the Atkins diet is appetite suppression. Many followers of the plan report that the between meal hunger pangs they used to experience fade away very quickly. This makes it easier to stay on...
Winter Big Catfish and Carp Fishing Baits and Oleoresin Bait Tips
by Tim Richardson
Feb 21, 2008
If you use ready made baits for all your carp and catfish fishing needs it may well be in your interests to read on...
If you are a beginner or not, it is very common to have an interest in making your own baits after having some initial suc...
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