[AMRadio] Re: 810's

WE0H we0h at yahoo.com
Sat Aug 25 02:17:36 EDT 2007

On that thought, 3M Windo-Weld P/N 051135-08609 may be useful. Available 
at AutoZone and other auto parts stores as well as some automotive body 
shops. It is a very high durometer black colored urethane in a caulking 
tube used for gluing in windshields in vehicles. Also used for filling 
in motor mounts in Sport Compact cars. It's got a little give to it but 
wicked strong when cured.


ne1s wrote:
> Todd, KA1KAQ writes:
>> Rick, it's been a while for me, but the main issue I recall was
>> expansion/contraction, with the envelope heating or cooling at a rate
>> that the glue couldn't match, resulting in cracked tube or broken
>> seal. It's been a long time though, so I really don't recall the
>> particulars.
>> JB Weld is used on engines and other high temp applications as
>> mentioned, so it would probably be fine. I run 810s as modulators and
>> they do get hot, but I doubt it would be an issue.
> Guys, although JB Weld is good stuff, I'd shy away from it for this 
> application. It's rigid stuff when cured, and if its thermal expansion 
> coefficient differs "enough" from glass, something is going to give, and 
> it will probably be the glass.
> I'd use high-temperature silicone (like the black stuff they sell for 
> gaskets at the automotive stores), because it stays somewhat "squishy," 
> and so will circumvent the above problem. That's what I'm going to try 
> on an 812A I have with a loose plate cap.
> JB Weld MAY work out OK, but...
> 73,
> -Larry/NE1S

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