[Shop-talk] Plastic epoxy/solvent weld

[Chuck Spalding]

This discussion has been very interesting, because I have struggled with
glueing plastics.

However the key point, to me, has not been mentioned: How to identify the
*type* of plastic. Can somebody provide clues?

Another challenging question (for me): What product works well
on polyethylene and polypropylene, *and* has a good shelf life. I have used
"Loctite Super Glue All Plastics", which works well but is expensive and
has a short shelf life after being opened.

Chuck

On Wed, Oct 8, 2025 at 11:17 AM <shop-talk-request at autox.team.net> wrote:

>
> Message: 1
> Date: Tue, 7 Oct 2025 13:18:30 -0500
> From: David Scheidt <dmscheidt at gmail.com>
> To: Jim Stone <1789alpine at gmail.com>
> Cc: Shop Talk <shop-talk at autox.team.net>
> Subject: Re: [Shop-talk] Plastic epoxy/solvent weld
>
> [snip]
>
> Methylene chloride is the traditional solvent for acrylic welding. It is
> now banned for most uses, so newer forulmulations use something else. I
> have not used any of them, as I don?t work with acrylic. But I did do some
> in the mists of time.  There were two types we used.  One was a thin liquid
> (straight methylene chloride, or very nearly, I think) that was used for
> fabricating stuff with tightly fitted gap free joints.  The other was a gel
> that would work for joints with a gap, it had acrylic in it, I think, which
> is what gave it gap filling power.  Pick the right sort, based on how well
> your parts go back together.
>
> [snip]
>
> End of Shop-talk Digest, Vol 19, Issue 151
>
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