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Posted: Fri Jan 02, 2009 9:07 am
by MrAl

Nice pics, thanks for posting those.

I'd like to see what happens when the hot glue meets up with
the suns rays for prolonged periods of time.

Posted: Fri Jan 02, 2009 9:16 am
by psycho
What about wax? Not hard enough???

Posted: Fri Jan 02, 2009 9:24 am
by MrAl
Hi again,

Ohh, i see now, there are at least two types of GE Silicone II...
One is the type you have: GE Silicone II, and the other is the type i have:
GE Silicone II XST shown here: ... iixst.html
The XST stuff can be painted over.

Posted: Fri Jan 02, 2009 11:55 am
by Janitor Tzap
Nice pic's evahle, :cool:

Thou, on the one picture of the board that was covered in clear silicone.
It may not be the Lead that is causing the corrosion reaction with the silicone.
But, the Flux content in it.
Most are a combination of 60% Lead, and 40% Flux.

There are also some that are a combination of Lead, Tin, and Flux.

After I'm done soldering on a board.
I will clean the area with some Isopropyl Alcohol, to remove as much flux as I can.

But even on a board that looks Flux free.
Heat from Power Resistors, Power Transistors, Power Diodes, and Transformers.
Will cause the flux to re-flow out from the solder joints.

The only thing you can do is use solder has less flux in it.
But then that can make soldering heavy leads, grounding points, and RF Shielding difficult.

I know some years ago a few board builders replaced the Chemical Flux
that they used in their solder wave machines with ordinary Lemon Juice.
Thus, instead of using alcohol, or expensive Chemical Flux Removers.
The boards were just rinsed off with Distilled Water.

Signed: Janitor Tzap

Posted: Fri Jan 02, 2009 3:30 pm
by jwax
psycho said,
What about wax? Not hard enough???
Wax can be a great encapsulant, but its bond to wires is marginal.
Thus, any moisture can easily travel through the wire-wax interface, contaminating the interior. It takes time, so some applications could probably use it. Certainly cheap and easy to use.

hot glue

Posted: Fri Jan 02, 2009 6:21 pm
by evahle
Thanks Guys!

evahle :smile:

Posted: Fri Jan 02, 2009 6:51 pm
by Dean Huster
Most of the silicone sealants you buy at the home centers these days have greatly-reduced quantities of acetic acid. The original RTVs had such heavy concentrations of acetic acid that it destroyed any copper on circuit boards, components and wiring, even if you were just using it to seal a cover on or stop up a hole -- not even using it for potting.

I need to get out the microfiche and look up the sealing procedures for the Tektronix 1502/1503 TDRs -- they listed several silicone compounds, both from Dow-Corning and from GE for electrical use. there were some that had viscosity differences, others that were primers, etc. I've used the specialized non-corrosive types and note that they tend to run more, take a lot longer to cure and the result has a different, less-rubbery and elastic feel that the silicone sealant we're used to from the home supply centers.

Florists melt hot-melt glue in small electric frying pans (you know, the ones with the little temperature control in °F) to use like a solder pot for dipping the ends of wires and floral assemblies in to keep them "as one".

Don't forget that one of the "nice" characteristics of hot melt glue is shared by molten solder: it likes to stick in one spot when molten. Solder spashes into your socks and stays there, burning your ankle; hot melt gets on your finger and stays there and you can't wipe it off quickly enough that it won't cause a blister at times.


Re: hot glue

Posted: Sun May 13, 2018 11:58 am
by evahle
evahle wrote:My first experiment with hot glue was using a small plastic cap for a form. I used petroleum jelly to line the inside of the cap to prevent the hot glue from sticking.

After filling the cap with hot glue, I placed 3 LEDs (Red, White & Blue) inside before the glue hardened.

This is what it looked like after lighting each LED the next day: ... VFcFQ4aFJB

Notice how it has a warm glow when lit, which is what I wanted. Now I could make any shape, for any project. I'm very particular about my projects and expect them to look as professional as possible. That was a fun experiment and I'm ready for the next one.

evahle :smile:

Re: Experimenting with Hot Glue..

Posted: Sun May 13, 2018 12:02 pm
by evahle
I've tried to repost the pictures since they seem to have disappeared. I just get an error. I'll try again.
Nope I get this message: "Sorry, the board attachment quota has been reached."
Too bad, I also had the conclusion to those experiments.
I clicked on the image in my last post and it shows a couple of cute asian girls. I manage several Facebook groups, and I don't ever allow something like that in my groups!
I'll try to repost the pictures again and see what happens. I'm really disappointed that this forum has really gone down hill since I was on here last. :(

NOPE, all I get is : "Sorry, the board attachment quota has been reached."
Wow! I literally have hundreds of photos and videos on Facebook. Maybe I should post links to my Facebook albums instead.

I tried to contact Vern on Facebook a couple of weeks ago about the inabilty to log in to this forum. I got no response from him, however, I guess the administrator of this forum finally got it straightened out.
Good grief!!

Re: Experimenting with Hot Glue..

Posted: Mon May 21, 2018 10:51 am
by evahle
Let's try a link to one of my Facebook albums. This one contains the Hot Glue experiments: ... 197&type=3

Re: Experimenting with Hot Glue..

Posted: Sat Jun 09, 2018 10:09 pm
by evahle
The link above with the Hot Glue Experiments, with the conclusion, will require that you're a member of Facebook. It's set to public so everyone can see. There's a couple of other albums that have my other projects as well. Let me know if you can see them so I'll continue posting all the projects that I've accumulated over the years here in this forum, and on Facebook.

Re: Experimenting with Hot Glue..

Posted: Tue Jun 12, 2018 6:40 pm
by evahle
Ok, I'm going to try to upload the pics here and the conclusion:

Re: Experimenting with Hot Glue..

Posted: Tue Jun 12, 2018 6:48 pm
by evahle
Ok, first problem. jpg pics not allowed. Most common type.
I'll try png next.
Nope, not allowed! Grrr.

Also conclusion in rtf format not allowed.
Hmmm, maybe bmp? Awful large files with bmp though.
I'll try that later.

Re: Experimenting with Hot Glue..

Posted: Wed Jun 13, 2018 12:28 pm
by evahle
Nope. Error BMP file too big!

Re: Experimenting with Hot Glue..

Posted: Sat Jun 16, 2018 9:14 pm
by evahle
Let me know if you can see the photo of my experiment: ... VFcFQ4aFJB