In article , Steve Dunbar
wrote:

There is a plastic pipe sold in the US specifically for compressed air use.
It is _not_ PVC pipe, which is dangerous and illegal to use for compressed
air. This stuff is usually colored green and is made from ABS. Chem-Aire is
one brand name. It is much more expensive than PVC pipe. It is not
compatible with some synthetic compressor oils. I don't know if this pipe
is available in England.

A forklift driver at work broke one of these green plastic air lines a while
back. It did not throw shrapnel like a PVC pipe would have.

We use a type of plastic pipe on the printing presses in our plant,
this is 1/4" ID and up to 90 PSI, it is usually black and semi rigid,
depending on the supplier, when it blows it is usually just a pin hole
that you can hear hissing.

--
http://sawdustmaking.com