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QUOTE (Walter @ 24 Sep 2007, 11:29) <{POST_SNAPBACK}>It's pricey though, so for the rest of my layout I used extruded polystyrene insulation boards. This is different frome the white expanded polystyrene - much denser, easier to shape and stronger. It's used for roof insulation and got mine off a branch of Sheffield Insulations, a wholesalers.

The extruded stuff is much better than the expanded stuff, it cuts well with a hot knife & saws well with far less mess & the "dust" does not stick to everything.

If you ask the wholesalers nicely they will probably give you damaged panels - they can't always sell it & it costs them money to dispose of it.

Warning - be careful cutting any plastics using heat - cyanide gas can be given off, just take sensible precautions.
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