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Insulation fibres. Coloured scanning electron micrograph (SEM) of a sample of fibres from a Isofloc - a material used as a cavity wall insulation. Isofloc is produced from very finely shredded waste paper with borax (boric acid, blue) added as a fire re5atardant. Magnification: x3,300 when printed 10 centimetres wide.
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