Abstract: The present invention generally relates to polyurethane foam composition. In one embodiment, the present invention relates to polyurethane foam compositions that have increased and/or improved fire-retardant properties due to the inclusion of one or more liquid and/or solid fire-retardants. In another embodiment, the present invention relates to polyurethane foam compositions that have increased and/or improved fire-retardant properties due to the inclusion of one or more intumescent materials (e.g., expandable graphite (EG)). In still another embodiment, the present invention relates to polyurethane foam compositions that have increased and/or improved fire-retardant properties due to the inclusion of expandable graphite.

Abstract: A ceiling system including a base ceiling structure for suspending from a structural member of a building, a substrate attached to the base ceiling structure, and a sprayable reinforcing material adhered to the substrate. The sprayable reinforcing material and the substrate together form a self-supporting composite material. A method of forming the coated ceiling structure includes the steps of providing a base ceiling structure having an outer surface, applying a foam material in a fluid state to the outer surface of the base ceiling structure, and solidifying the foam material to form a rigid reinforcing layer on the base ceiling structure. Alternatively, the base ceiling structure is a non-self-supporting material, and a reinforcing material is sprayed onto an outer surface of the base ceiling structure. The reinforcing material and the non-self-supporting material together form a self-supporting composite structure.