JB Weld is RF "safe" (as they state on their Web site) and I have tested it
(the old glass of water with a sample of JB Weld in the microwave test) and
used it in RF environments.
73 de Perry - K4PWO
----- Original Message -----
From: "Gary "Joe" Mayfield" <gary_mayfield@hotmail.com>
To: <towertalk@contesting.com>
Sent: Saturday, April 11, 2009 22:18 PM
Subject: Re: [TowerTalk] JB Weld
Has anyone put some in the microwave to see if it heats up?
73,
Joe kk0sd
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Mike
Sent: Saturday, April 11, 2009 8:45 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] JB Weld
Yes, JB Weld is truly wonderful. A while back I managed to break the
aluminum cooling fan off the motor for my swimming pool pump while changing
the bearings. All that was left on the armature shaft was about one inch
diameter of circular ragged aluminum. With nothing to lose at this stage but
250 bucks, I used JB-weld to attach the rest of the fan to the remaining
piece that is attached to the shaft. It has been running at 3,800 rpm for
years. I would say that it attaches aluminum better than tenaciously:-)
JB-Weld is magic,
Mike
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Dennis W0JX
JB Weld is a wonderful adhesive. It has better tensile strength than most
epoxies (listed as 3960 psi on the package). It will adhere to plastics in
situations where most other epoxies will not. It will adhere to aluminum
tenaciously if the surface is cleaned and roughed up a bit.
However I question its insulation qualities at RF. While the packaging says
that it "does not conduct electricity" the packaging also states "The unique
J-B Weld formula of liquid steel and compound hardener..."
Therefore, I would avoid using it where a radiating or parasitic element
touches the compound itself. However, you could put some kind of appropriate
insulating barrier between the J-B Weld compound and the radiating/parasitic
element.
Dennis W0JX/8
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