I’m trying to find a supplier of HDU board for chip carving which is normally done on European Lime wood this generally runs at a density around 540 to 590kg per m3 because of a bit of arthritis I need something around 250kg/m3, there are such products available in the states but they are too expensive for me to import, be grateful if anyone could point me in the right direction

This the stuff? 

http://easycomposites.co.uk/#!/patterns-moulds-and-tooling/tooling-and-modelling-board/pu-medium-density-model-board.html

Thanks for that.

Density looks great is there a difference between polyurethane and urethane?