1. METHOD OF UNIFORMLY IMPREGNATING FIBROUS WEBS WITH A HEAT-HARDENABLE BINDER, THE IMPREGNATED MATERIAL BEING ADAPTED FOR THE PRODUCTION OF LAMINATED ARTICLES, WHICH COMPRISES THE SEPARATE STEPS OF IMPREGNATING POROUS FIBROUS MATERIAL WITH AN AQUEOUS SOLUTION OF HEXAMETHYLENETETRAMINE AND WITH A SOLVENT-FREE, HEAT-LIQUEFIED NOVOLAC RESIN REACTIVE WITH THE HEXAMETHYLENETETRAMINE TO FORM A HEAT-HARDENABLE BINDER, SAID RESIN BEING LIQUEFIABLE AT A TEMPERATURE BELOW THE CURING TEMPERATURE THEREOF TO A DEGREE SUFFICIENT TO PERMIT UNIFORM IMPREGNATION OF SAID WEB AND BEING ONE WHICH ON COOLING FORMS A CRYSTALLINE DEPOSIT IN THE WEB, THE IMPREGNANT FIRST APPLIED TO THE FIBROUS MATERIAL BEING ONE WHICH DEPOSITS ITSELF ON THE FIBROUS MATERIAL IN SUCH MANNER THAT SUFFICIENT POROSITY IS RETAINED BY THE FIBROUS MATERIAL FOR IMPREGNATION BY THE SECOND IMPREGNANT.