resin

[jindi1]

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. Resins are also a material in nail polish.

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.

Some resins when soft are known as 'oleo-resins', and when containing benzoic acid or cinnamic acid they are called balsams.

Other resinous products in their natural condition are a mix with gum or mucilaginous substances and known as gum resins.

Many compound resins have distinct and characteristic odors, from their admixture with essential oils.

Certain resins are obtained in a fossilized condition, amber being the most notable instance of this class; African copal and

the kauri gum of New Zealand are also procured in a semi-fossil condition.

[Len]

You say resin, I say rosin.

The information you present is no doubt true. However, PVC resin manufacturers, users, captive and commercial compounders, and additive suppliers have call the PVC powdered, polymer material resin for as long as I've been in the business.

Len

[Dr. Dick]

Len,
Not only PVC suppliers et al but other polymer suppliers as well. I feel that the "resin" term is most often used for "virgin" (or neat) polymers before compounding. However as the plastics industry grew the fuzzy factor set in for the term "resin" is used generically for plastics materials coming into the plant. The rubber industry never went to using the resin terminology for rubber compounds. However we have heard the term TPE "resins".

All rosins are resins, but not all resins are rosins. Remember Amber is a rosin of great value and some where in Germany is the famous Amber Room stolen from the Russians during WWII

[Louis]

Ha Ha,

Timely post, we were told that the PVC resin we purchase is a compound with the main ingredient being a resin.

You say toMAYto and I say TaMAto tomato

[Dr. Dick]

Goes with " PoTAYto, poTOTto , let's call the whole thing off"

[Len]

Ha Ha,

Timely post, we were told that the PVC resin we purchase is a compound with the main ingredient being a resin.

You say toMAYto and I say TaMAto tomato

That's the way, ahh haa ahh haa, I like it! Ahh haa ahh haa!

Resin is the virgin stuff, PVC compound has resin, stabilizer, filler, etc. in there.

Len

[Louis]

Ha Ha Nice oldies!

Don't make me link some music files to this thread

[Dr. Dick]

Louis,
If you don't maybe I will....

[Louis]

Ha

http://www.storth.com/midi/kcsunhine-thatsthewayilikeit.mid