Method for manufacturing a dimensionally stable object, preferably a container, comprising the following steps: - Providing renewable biomass,, wherein the renewable biomass contains at least fibres with lignin, in particular cellulose fibres with lignin, hemicelluloses and cellulose, and wherein the renewable biomass is selected from the group of lignocellulose-containing annual plants, comprising at least lignin-containing central lamellae, cell gussets, primary and secondary walls, - comminuting the renewable biomass,, - adding water to the renewable biomass, - pre-treatment the renewable biomass by substantially converting the renewable biomass into biomass fibrous material by means of a high-temperature steam digestion process (IVb) providing a steam, wherein the temperature of the steam used is in the range from 150°C to 280°C, preferably in the range from 175°C to 250°C, and wherein the digestion time by means of the steam is in the range from 10 s to 900 s, preferably in the range from 20 s to 300 s, while retaining a majority of the lignin in the fibres, and while dissolving and discharging a part of the cellulose and the hemicelluloses, wherein the relative amount of lignin is increased, - providing the biomass fibrous material, in a moulding process with an object mould to form an object moulding, - thermally treating the object moulding by transferring at least partially the lignin contained in the fibres of the biomass fibrous material to the outer surface of the fibres, wherein the lignin is made accessible by tearing open the lignin-containing central lamellae, the cell gusset, the primary and/or the secondary walls, - creating an at least partially irreversible bond (VIII) of the object moulding by cross-linking the fibres of the biomass fibrous material with one another by means of the lignin. - Providing renewable biomass,, wherein the renewable biomass contains at least fibres with lignin, in particular cellulose fibres with lignin, hemicelluloses and cellulose, and wherein the renewable biomass is selected from the group of lignocellulose-containing annual plants, comprising at least lignin-containing central lamellae, cell gussets, primary and secondary walls, - comminuting the renewable biomass,, - adding water to the renewable biomass, - pre-treatment the renewable biomass by substantially converting the renewable biomass into biomass fibrous material by means of a high-temperature steam digestion process (IVb) providing a steam, wherein the temperature of the steam used is in the range from 150°C to 280°C, preferably in the range from 175°C to 250°C, and wherein the digestion time by means of the steam is in the range from 10 s to 900 s, preferably in the range from 20 s to 300 s, while retaining a majority of the lignin in the fibres, and while dissolving and discharging a part of the cellulose and the hemicelluloses, wherein the relative amount of lignin is increased, - providing the biomass fibrous material, in a moulding process with an object mould to form an object moulding, - thermally treating the object moulding by transferring at least partially the lignin contained in the fibres of the biomass fibrous material to the outer surface of the fibres, wherein the lignin is made accessible by tearing open the lignin-containing central lamellae, the cell gusset, the primary and/or the secondary walls, - creating an at least partially irreversible bond (VIII) of the object moulding by cross-linking the fibres of the biomass fibrous material with one another by means of the lignin.