1. AN IMPRESSION MATERIAL COMPRISING A COAGULATED MIXTURE OF AN INORGANIC ELECTROLYTE, AT LEAST ONE LATEX EMULSION SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBER AND SYNTHETIC RUBBER LATICES AND AT LEAST ONE EMULSION SELECTED FROM THE GROUP CONSISTING OF EMULSIONS OF POLYCYCLOPENTADIENE AND A POLYMER IN WHICH CYCLOPENTADIENE IN 1,4- OR 1,2-FORM IS POLYMERIZED TO A SERIES OF FIVE-MEMBER RINGS OF CARBON ATOMS, WITH AN APPROXIMATE MOLECULAR WEIGHT OF ($)(30*,TOLUENE) = 0.1 TO 5.0 AND A HOMOPOLYMER OR COPOLYMER OF VINYL MONOMERS HAVING THE GENERAL FORMULA H2C=C(-R)-X WHEREIN X REPRESENTS A HYDROGEN ATOM, ALKYL GROUP HAVING C1-C20, AN ARYL GROUP, HALOGEN, NITRILE GROUP, CARBOXYL GROUPS CARBOALKOXY GROUP, OR ACYLOXY GROUP, AND R REPRESENTS A HYDROGEN ATOM, ALKYL GROUP HAVING C1-10 OR ALKENYL GROUP HAVING C2-C10, THE AMOUNT OF SAID POLYCYCLOPENTADIENE BEING FROM 10 TO 50 PERCENT BASED ON THE WEIGHT OF LATEX AND THE AMOUNT OF VINYL POLYMER IS 10 TO 50 PERCENT BASED ON THE LATEX.