"Rick Hughes" wrote in message
...
saw thread recently on expanding faom and thought this might be of
interest.

I have a new Alkathene pipe (or MDPE to give factual type) bringing mains
water into the build, this come sin via a PVC conduit.

The water board want the conduit filled with insulation - I asked about
expanding foam - and they advised that under no circumstances muct
expanding
foam come into contact with MDPE pipe - it eats it away.


Anybody else come across this, I would like to follow up and see if true.


rick



I've heard of the foam eating into plastics and things, but I've never read
anywhere that it does. We use polyurethane guns to inject the foam into
gaps and things, so I would have thought that if it did eat into plastics,
they would sell you a plastic gun to use as the application method. I've
never read on the instructions that is has any adverse effects on the things
around it and it only says that it is flammable will still in the container,
and that you should wear protective gear in case it gets in your eyes or on
your skin. But that's just because of the propellant that's used to blow it
out the tin.

Some foams are now resistive to UV in the sunlight and some are even being
used as water repellents on or under other surfaces. All this stuff is on
the tin when you look, so I would have thought the makers would have made
anything about it ruining other materials more apparent in their guide on
the containers.


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