Re: [Paddlewise] glue for minicell/polyethylene

One of the things to consider is whether you are looking at an adhesive bond
or a cohesive bond. In an adhesive bond, you are using a bonding agent and
it attaches to each of the materials in effect bridging them. While in a
cohesive bond the bonding agent causes the material to "flow" into the
other, much as welding causes to materials to "mix" and forms a direct bond.

Solvent based "glues/cements" are typically cohesive bonds.
Welding is a cohesive bonding process (although I'm sure some cold welds are
so bad as to be adhesive).
Glues like superglue, or even Elmers on the other hand are adhesive bonds.

Mixing two cohesive bonding agents together for two dissimilar materials is
unlikely to get a very good bond. The cements you are talking about, are
probably cohesive rather than adhesive.

Maybe one of the Chemists in the group can explain this more clearly.

-Saul - not a chemist, just a paddler.

-----Original Message-----
From: Shawn W. Baker <baker_at_montana.com>
To: Paddlewise <PaddleWise_at_lists.intelenet.net>
Cc: Peter Osman <PeterO_at_ambri.com.au>; Mark Zen <canoeist_at_netbox.com>
Date: Monday, July 12, 1999 9:47 AM
Subject: Re: [Paddlewise] glue for minicell/polyethylene


>I was in the hardware store this weekend buying some of that PVC cement
>to patch vinyl drybags with--yep, PVC pipe and PVC drybags are the same
>stuff--one is just a bit more flexible.
>
>On the rack next to the PVC cement was some cement for PE
>pipe--polyethylene is sometimes used for drain pipe.  It would probably
>stick great to the plastic, but I couldn't tell you how well it would
>stick to the minicell.  Maybe put PE cement on the boat, and
>barge/shore/contact cement on the minicell and slam the two together.
>
>Shawn
>
>Peter Osman wrote:
>>Don't know if its been suggested yet but I was told that the glue used by
>>plumbers for PVC pipe should work on polythene - haven't tried it myself -
>>probably wise to try it on scrap polythene first.
>>
>>PeterO
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