RadioBanter - Coil Dope

On Feb 10, 10:39*pm, "Dr. Barry L. Ornitz"
wrote:
"JIMMIE" wrote in message

..
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I believe *what you are describing is Duco cement the kind that I
used to use to build model cars.
Is that stuff still around? I think they took it off the market
because of the glue huffers. If *it is still around it should make
excellent coil dope.

Duco Cement is made by the Permatex division of ITW/Devcon. *It has not
been taken off the market, but in some communities its sale is restricted
to keep it away from children.

Duco Cement is cellulose nitrate dissolved in acetone. *It is plasticized
by a small amount of camphor (probably for historic reasons, camphor was
the plasticizer used in celluloid and pyroxylin around the turn of the 20th
century).

As I stated in the post you quoted, cellulose nitrate is far from the best
radio frequency insulator. *Fingernail polish performs slightly better as
an RF insulator but polyvinyl chloride is worse. *I still recommend General
Cement commercial Q-dope which is polystyrene dissolved in toluene or
methyl-ethyl-ketone (GC has changed their formulation). *You can make your
own inexpensively by dissolving Styrofoam shipping "peanuts" in toluene.
methyl-ethyl-ketone, or acetone. *Of these three solvents, acetone is the
safest. *Home Depot used to sell all three solvents in the past, but sadly
there is no store near me where I now live.

--
73, Dr. Barry L. Ornitz *WA4VZQ

[transpose digits to reply]

I thought Duco was disolved polystyrene, perhaps it was some other
brand of "model airplane" glue.

Jimmie