1. THE METHOD OF MAKING A HARD, DENSE ELECTRICAL INSULTING LAMINATED ASBESTOS PRODUCT HAVING HIGH DIELECTRIC STRENGTH, COMPRISING: (A) IMPREGNATING ASBESTOS PAPER HAVINGA THICKNESS IN THE RANGE OF ABOUT 8 TO 18 MILS WITH AN AQUEOUS SOLUTION OF MONO-ALUMINUM PHOSPHATE, (B) DRYING THE IMPREGNATED PAPER TO SUBSTANTIALLY REMOVE TACKINESS, (C) COMPRESSING THE DRIED PAPER UNTIL ITS THICKNESS IS REDUCED ABOUT 30-42%L, (D) COATING THE COMPRESSED PAPER WITH AN AQUEOUS SOLUTION OF ALUMINUM PHOSPHATE OF THE FORMULA ALX(H3-XPO4)3, (D'') WHEREIN X HAS A VALUE OF FROM 1.3 TO 1.7, AND (E) FORMING A LAMINATED PRODUCT FROM THE COATED PAPER.