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Spray-on insulation is a powerful and relatively recent plastic material, with an insulating efficiency (rated in R-values) that amounts to the double of traditional insulation products like fiberglass batts/rolls.

Most of spray-on insulation is made of liquid polyurethane or polystyrene, also found in small aerosol cans and used in refrigerators and water heaters (see also, for elements on the environmental impact of this type of insulation: Insulation materials and the environmental issue).