The present invention relates to a method of impregnating paper with a suspension of a molecular sieve in waterglass, such as soda waterglass or potassium waterglass, wherein the impregnated paper can be used as a dehumidifying element, and wherein the method comprises the steps of a) providing a piece of paper, such as facing paper and/or fluted paper; b) immersing the paper into a highly concentrated waterglass solution in which a molecular sieve has been suspended, at a temperature in the range of 45-95.degree. C., wherein said suspension of highly concentrated waterglass/molecular sieve has a viscosity of at least 350 mPa.s at a temperature of 45.degree. C.; and c) cooling the immersed paper with air at a temperature of at most 35.degree. C. and preferably at most 25.degree. C.