"Tom Donaly" wrote in message
...
NoSPAM wrote:
For ultraviolet protection, a small amount of titanium dioxide may be
added (1 to 5%), but the microballoons will do a fair job alone.
Painting the finished insulators with acrylic paint (KrylonŽ) will also
provide good UV resistance.
Where do you buy the titanium dioxide?
73,
Tom Donaly, KA6RUH
I was sent 10 pounds from a friend at DuPont, one of the larger
manufacturers of titanium dioxide. For small quantities, I would suggest
contacting a local paint manufacturer, or artist supply store. The pigment
is used in many ultra-bright white formulations. Note that titanium
dioxide has a high dielectric constant between 85 and 110 depending on the
ratio of rutile to anatase. So to minimize detuning effects of the
insulators, use them only at low impedance points of the antenna.
73, Dr. Barry L. Ornitz WA4VZQ
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