[Top] [All Lists]

Re: [TowerTalk] non conductive sealant

Subject: Re: [TowerTalk] non conductive sealant
Date: Mon, 04 Oct 2004 10:59:58 -0400
List-post: <>
From: "FireBrick" <>
To: "TowerTalk List" <>
Sent: Saturday, October 02, 2004 4:35 AM
Subject: [TowerTalk] non conductive sealant

> Can anyone suggest of brand of sealant that can be used on antennas that's
non conductive?
> I'm thinking about silicone type sealants.
> I had tested a glob of silicone I had using the unscientific VOM and found
that it was
> conductive.

I guess my question is where are you going to use it and for what purpose? What 
does the manufacturer say? Do they say to seal whatever it is you're worried 

For aluminum joints you just need an antioxidant in there. For coax joints you 
need good electrical tape and a vapor barrier to prevent water incursion. 

The problem with RTV (room temperature vulcanizing) is that it outgasses an 
acid while curing and the acid can get into your joint (acetic acid? I'm going 
from memory here). It is NOT recommended for electrical-type applications.

If you insist on using RTV, get the kind for aquariam use - it doesn't have the 
outgas problem. 

For coax connections, use a couple of wraps of Scotch 33 or 88, a butyl rubber 
vapor-wrap layer, and then 2-3 more wraps of electrical tape. That's a 
bomb-proof professional joint. 

Steve    K7LXC
Professional tower services for commercial and amateur 
Cell: 206-890-4188

See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>