Bill Powell wrote:
> A quick and dirty test for JB Weld as an RF insulator:
>
> Mix up a small lump, let it harden and microwave it (along w/ a cup of water).
> If it get's hot it has absorbed microwave energy and is a questionable RF
> insulator.
>
However even some ceramics that make good insulators at HF and VHF will
get really hot in a microwave.
73
Roger (K8RI)
> Bill - WB1GOT
>
>
>> 8. Re: JB Weld (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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