A method of preparation of an intermediate product for manufacturing a gasket, constituting a paste comprising a powdered sealing material, a solvent, a binder and a plasticizer, according to the invention is characterized by the use of from 50 to 80% by volume powdered sealing material in relation to the volume of the solvent, from 1 to 15% by weight of the binder in relation to the mass of the powdered sealing material, from 1 to 20% by weight of the plasticizer in relation to the mass of the powdered sealing material. While preparing the intermediate product, the solvent is mixed with the binder and the plasticizer until achieving homogeneity. Then the powdered sealing material is added, after what it is mixed again until achieving homogeneity.
The invention concerns also an intermediate product and a method of manufacturing a gasket with the use of this intermediate product.