Method for manufacturing a dimensionally stable object , preferably a container, comprising the following steps: - Providing renewable biomass , (I), 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 , (II), - adding water (III) to the renewable biomass , - pre-treatment (IV) 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 , (V) in a moulding process (VI) with an object mould to form an object moulding, - thermally treating (VII) 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 , (I), 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 , (II), - adding water (III) to the renewable biomass , - pre-treatment (IV) 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 , (V) in a moulding process (VI) with an object mould to form an object moulding, - thermally treating (VII) 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 . <EOS>