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Enersign windows use Neopor on the outside (under the fibreglass). For other applications, see http://www.ecobuildproductsearch.co.uk/expandable-polystyrene-insulation-eps-neopor-prod005562.html
It is claimed to have 20% better insulation performance than plain EPS.
Has anyone got an opinion on this product? What is it good for? What is it not good for?