Polyurethane (PU)

Polyurethane is rigid foam material injected to core with CFC free blowing agent to a high density (42kg/m3-45kg/m3) PU contain no residue pentanes as it self extinguished fire retardant.
The coatings of the steel skin usually modified polyester or acrylic paint, finished with an antibacterial or food-grade coatings based on the requirements.