Lord Doug Pauls took the words out of my mouth :-)
Resin and rosin? Rosin is a specific resin, but resin is a generic term
for hundreds of organic solids, usually transparent or translucid and
breaking with a conchoidal fracture. Oxford defines resin as:
1. Any hard, sticky, flammable, freq. aromatic substance containing
organic polymers and terpenoids, secreted by various trees and other
plants, often extracted by incision esp. from fir and pine, and, unlike
a gum, insoluble in water; a kind of this. LME.
2. A resinous precipitate obtained by chemical treatment of various
natural products. rare. L17.
3. Any synthetic material resembling a natural resin; now usu., any of
a large and varied class of synthetic organic polymers (solid or liquid)
that are thermosetting or thermoplastic and are used esp. as the chief
ingredients of plastics (more fully synthetic resin). Freq. with other
specifying words. L19.
I'll add to this that resins can sometimes also be secreted by insects,
the most noted one being lac, a red-coloured resin produced by a kind of
beetle. Cochineal is another red, rather waxy, resin, used as a dye,
extracted from the corpses of a rather similar insect.
On the other hand, rosin is defined by Oxford as
1. = RESIN noun; spec. the solid amber residue obtained after the
distillation of crude turpentine oleoresin (also gum rosin), or of
naphtha extract from pine stumps (also wood rosin), used in adhesives,
varnishes, inks, etc., and for treating the bows of stringed
instruments. ME.
2. Alcoholic drink. slang. M18.
In terms of flux, only water-white rosin obtained by distilling pine
oleoresin is considered suitable. The best quality comes mainly from the
Iberian peninsula and the Landes region of France. It is a mixture of
tricyclic carboxylic acids (abietic, pimaric and their isomers), of
variable composition.
Note that there are other resins occasionally used in fluxes. One
example of a synthetic resin is the Multicore Xersin flux, sometimes
nicknamed WWF (Wally's Wonder Flux, after the inventor, Dr. Wallace Rubin).
Brian
Kevin wrote:
> Is it acceptable to mix flux types on a single piece of hardware? I have
> background in MIL/AERO requirements of the "rosin only" creedo. My past
> experience is with rosin types only, to avoid all the emotional customer
> issues and testing requirements. However, I am now working for a company
> and their SOPs dictate use of WS at first solder, followed by water
> clean. They then dictate rosin for any touchup, with hand clean only. Is
> there a risk in mixing water sol and rosin on a single piece of hardware?
> What about resin and rosin?
>
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