Urethane board is the thermal insulation material having the most excellent heat insulation performance out of the thermal insulation materials, has very excellent properties such as heat insulation, sound prevention, humidity blocking, light-weight, shock-absorption, etc. Urethane Board is used widely as thermal insulation materials for commercial building, apartment, residence, warehouse, and roof. For the product, there are general urethane board (PUR board) and urethane flame-retardant board (PIR board), having flame retardant capacity, which complements the inflammability, which is the weakness of the general urethane board (PUR board).