A process for preparing an inorganic foam, comprising the steps of mixing (i) at least one group of inorganic particles, wherein the inorganic particles are neither identical to the inorganic binders (iiia), nor to the alkaline activators (iiib); (ii) at least one amphiphilic compound; (iii) at least one inorganic binder mixture comprising (iiia) at least one inorganic binder selected from the group consisting of blast furnace slag, microsilica, metakaolin, and mixtures thereof, (iiib) at least one alkaline activator selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal aluminates, alkali metal silicates, and mixtures thereof; (iv) water; and optionally (v) at least one additive; and foaming the resulting foam formulation by chemical, physical or mechanical foaming, wherein the at least one amphiphilic compound comprises amphiphilic compounds with at least one polar head group and at least one apolar tail group, wherein the at least one head group is selected from the group consisting of phosphates, phosphonates, sulfates, sulfonates, alcohols, amines, amides, pyrrolidines, gallates, and carboxylic acids (i.e. -C OH groups); and wherein the at least one tail group is selected from an aliphatic or an aromatic or a cyclic group with 2 to 8 carbon atoms, wherein the carbon atoms are optionally substituted with one or more, same or different substituents selected from C 1 -C 8 -alkyl, secondary -OH, and secondary -NH 2. mixing (i) at least one group of inorganic particles, wherein the inorganic particles are neither identical to the inorganic binders (iiia), nor to the alkaline activators (iiib); (ii) at least one amphiphilic compound; (iii) at least one inorganic binder mixture comprising (iiia) at least one inorganic binder selected from the group consisting of blast furnace slag, microsilica, metakaolin, and mixtures thereof, (iiib) at least one alkaline activator selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal aluminates, alkali metal silicates, and mixtures thereof; (iv) water; and optionally (v) at least one additive; and (i) at least one group of inorganic particles, wherein the inorganic particles are neither identical to the inorganic binders (iiia), nor to the alkaline activators (iiib); (ii) at least one amphiphilic compound; (iii) at least one inorganic binder mixture comprising (iiia) at least one inorganic binder selected from the group consisting of blast furnace slag, microsilica, metakaolin, and mixtures thereof, (iiib) at least one alkaline activator selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal aluminates, alkali metal silicates, and mixtures thereof; (iiia) at least one inorganic binder selected from the group consisting of blast furnace slag, microsilica, metakaolin, and mixtures thereof, (iiib) at least one alkaline activator selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal aluminates, alkali metal silicates, and mixtures thereof; (iv) water; and optionally (v) at least one additive; and foaming the resulting foam formulation by chemical, physical or mechanical foaming, wherein the at least one amphiphilic compound comprises amphiphilic compounds with at least one polar head group and at least one apolar tail group, wherein the at least one head group is selected from the group consisting of phosphates, phosphonates, sulfates, sulfonates, alcohols, amines, amides, pyrrolidines, gallates, and carboxylic acids (i.e. -C OH groups); and wherein the at least one tail group is selected from an aliphatic or an aromatic or a cyclic group with 2 to 8 carbon atoms, wherein the carbon atoms are optionally substituted with one or more, same or different substituents selected from C 1 -C 8 -alkyl, secondary -OH, and secondary -NH 2.