Abstract: The invention relates to polymer-coated oven board and a closed oxygen impermeable food package formed from it. According to the invention, the coating on the board (1) contains an oxygen barrier layer (7) of polyamide (PA) and a surface layer (8) of polyethylene terephlatae (PET) adhered to it without a binding agent layer between them. The polymer layers (7, 8) have been produced by co-extrusion so that the polyamide layer (7) adheres directly to the board in extrusion. In a closed package according to the invention, the superimposed polyamide and PET layers (7, 8) are located inside the board layer, and on the outer surface of the package there may be a PET layer (9). The package is sealed by heat sealing the PET layers. Polyamide has been selected so that it withstands heat sealing and the heating of the package in an oven.