Tray package unit outer packaging paper and method for producing same

A tray package unit outer packaging paper for packaging tray package units having a first side and a second side, which tray package unit outer packaging paper is made of at least one aqueous suspension comprising a pulp material and additives, wherein the pulp material comprises a pulp mixture of, long-fibre pulp having a length-weighted average fibre length according to ISO 16065-2:2014 of 1.5 mm to 3.0 mm or consists of such, that the suspension comprises at least one sizing agent as additive, which sizing agent is added in a quantity of 0.05 wt % to 2 wt % relative to 100 wt % of dry weight mass of the suspension in relation to the active substance of the sizing agent, that the at least one sizing agent is selected from the group of alkenyl succinic acid anhydride (ASA), alkyl ketene dimer (AKD), resin sizes or natural sixing agents or comprises a mixture of sizing agents selected from this group at least the first side is compacted with a linear load of 80 kN/m to 500 kN/m and that the tray package unit outer packaging paper has a wet strength index according to ISO 3781:2011 in the machine direction of at least 10 Nm/g.