Polyurethane integral skin foams comprise a low density foamed core surrounded by a high density skin of the same material, and are made in a single molding operation. Polyurethane integral skin foams find wide application as structural materials, and the mechanical properties of such foams are significantly affected by the foam structure, which in turn is determined by the foaming process. The customer often requires specific and small volumes which are mostly used as spare parts. Customers in this niche market often come from the furniture industry (manufacturers of consumer furniture as well as office furniture), theme parks/fairground attractions and the health care branch. It is therefore mostly used in armrests and headrests in furniture, as shock protection, safety brackets, seats, backs of chairs and chairs of various attractions and in escalator lifts, rollators (handles and shelves) and wheel chairs.