A composition consisting of the following constituents: (a) 1 to 30 wt.% of at least one hydrogen phosphate selected from the group consisting of mono- and dihydrogen phosphates of sodium, potassium, magnesium, calcium, aluminum, zinc, iron, cobalt and copper, (b) 1 to 40 wt.% of at least one compound selected from the group consisting of oxides, hydroxides and oxide hydrates of magnesium, calcium, iron, zinc and copper, (c) 40 to 95 wt.% of at least one particulate filler selected from the group consisting of glass, mono-, oligo- and polyphosphates of magnesium, calcium, barium, and aluminum; calcium sulfate; barium sulfate; simple and complex silicates comprising sodium, potassium, calcium, aluminum, magnesium, iron and/or zirconium; simple and complex aluminates comprising sodium, potassium, calcium, magnesium, and/or zirconium; simple and complex titanates comprising sodium, potassium, calcium, aluminum, magnesium, barium and/or zirconium; simple and complex zirconates comprising sodium, potassium, calcium, aluminum, and/or magnesium; zirconium dioxide; titanium dioxide; aluminum oxide; silicon dioxide; silicon carbide; aluminum nitride; boron nitride and silicon nitride, and (d) 0 to 25 wt.% of at least one constituent other than constituents (a) to (c), wherein the weight proportions of constituents (a) to (c) or (a) to (d) add up to 100 wt.%, wherein complex silicates, complex aluminates, complex titanates and complex zirconates are silicates, aluminates, titanates and zirconates with more than one type of cation, wherein constituent (a) may comprise up to 10 wt.% of free water which is not bound as crystal water in the at least one hydrogen phosphate, based on the total constituent (a), wherein constituent (d) may comprise up to 10 wt.% of water, based on the total constituent (d), wherein the composition is present as a two-component system, and wherein constituents (a) and (b) are present separately from one another. (a) 1 to 30 wt.% of at least one hydrogen phosphate selected from the group consisting of mono- and dihydrogen phosphates of sodium, potassium, magnesium, calcium, aluminum, zinc, iron, cobalt and copper, (b) 1 to 40 wt.% of at least one compound selected from the group consisting of oxides, hydroxides and oxide hydrates of magnesium, calcium, iron, zinc and copper, (c) 40 to 95 wt.% of at least one particulate filler selected from the group consisting of glass, mono-, oligo- and polyphosphates of magnesium, calcium, barium, and aluminum; calcium sulfate; barium sulfate; simple and complex silicates comprising sodium, potassium, calcium, aluminum, magnesium, iron and/or zirconium; simple and complex aluminates comprising sodium, potassium, calcium, magnesium, and/or zirconium; simple and complex titanates comprising sodium, potassium, calcium, aluminum, magnesium, barium and/or zirconium; simple and complex zirconates comprising sodium, potassium, calcium, aluminum, and/or magnesium; zirconium dioxide; titanium dioxide; aluminum oxide; silicon dioxide; silicon carbide; aluminum nitride; boron nitride and silicon nitride, and (d) 0 to 25 wt.% of at least one constituent other than constituents (a) to (c), wherein the weight proportions of constituents (a) to (c) or (a) to (d) add up to 100 wt.%, wherein complex silicates, complex aluminates, complex titanates and complex zirconates are silicates, aluminates, titanates and zirconates with more than one type of cation, wherein constituent (a) may comprise up to 10 wt.% of free water which is not bound as crystal water in the at least one hydrogen phosphate, based on the total constituent (a), wherein constituent (d) may comprise up to 10 wt.% of water, based on the total constituent (d), wherein the composition is present as a two-component system, and wherein constituents (a) and (b) are present separately from one another. wherein the weight proportions of constituents (a) to (c) or (a) to (d) add up to 100 wt.%, wherein complex silicates, complex aluminates, complex titanates and complex zirconates are silicates, aluminates, titanates and zirconates with more than one type of cation, wherein constituent (a) may comprise up to 10 wt.% of free water which is not bound as crystal water in the at least one hydrogen phosphate, based on the total constituent (a), wherein constituent (d) may comprise up to 10 wt.% of water, based on the total constituent (d), wherein the composition is present as a two-component system, and wherein constituents (a) and (b) are present separately from one another.