IM is Italian fire reaction classification. This standard examines and classifies the flammability performance of upholstered parts (e.g. seats, backs and armrests) and of upholstered products (e.g. seating and pillows). It combines an ignitability test with a surface spread of flame test.

Selected Muuto upholstered furniture products (UK versions) are compliant to 1.IM.

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