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FM 4880

The Factory Mutual (FM) 4880 test is titled as "Class 1 (A) Insulated Wall or Wall & Roof/Ceiling Panels (B) Plastic Interior Finish Materials (C) Plastic Exterior Finish Material (D) Wall/Ceiling Coating Systems (E) Interior or Exterior Finish Systems". It is a large-scale room corner test that has been used to evaluate roof covering assemblies containing thermoplastic foam insulation. FM has used this option because their Calorimeter is not designed to evaluate thermoplastic materials. FM 4880 has no link to UL1256, FM 4450 or the large-scale White House test which is the basis for FM 4450 and UL 1256.