When flexible urethane foam was impregnated with a PVA solution at ambient pressure and then impregnated with SOUFA (boric acid fire retardant) at ambient pressure, only carbonization occurred and the fire retardant effect increased. There is a possibility that it can be considered as a heat insulating material for ducts and the like.

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CCM Testing

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Thickness 5 mm, 1.3 MJ/m2 (20 minutes)

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Thickness 10mm, 0.2 MJ/m2 (20 minutes)

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Thickness 10mm (after 10 rinses) 1.6 MJ/m2 (20 minutes)

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Thickness 50 mm, 2.6 MJ/m2 (20 minutes)