The purpose of a chimney is not to absorb RF radiation but to direct airflow.
The only specification that really matters is whether or not it will survive
the ambient temperature of its environment. It does not need to be a thermal
insulator. (Think glass chimneys fore 3-500 tubes.) I think a conventional oven
would be a better instrument with which to test the temperature survivability
of any given chimney material.
73,
Jim W5QM
________________________________
From: Paul Hewitt <wd7s@earthlink.net>
To: Amps Reflector <amps@contesting.com>
Sent: Friday, July 20, 2012 12:19 PM
Subject: [Amps] Silicone hose from Flex Technologies
Greetings
A few months ago someone posted the link for this company after using some
of their silicone hose for a chimney(s). I bought some of the 2.5 inch hose
for a pair of 3cx800's I have. It is a polyester reinforced product.
Unfortunately the hose did not survive the microwave test I gave it. Two
minutes in a 1KW microwave gets it so hot you can't touch it for ten
minutes. It might be OK for HF but above that I would be cautious. For
what it's worth before you spend the money.
Paul
PAUL HEWITT
WD7S PRODUCTIONS
QRO HOMEBREW COMPONENTS
http://home.earthlink.net/~wd7s
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