Mftrnn of maktivr mfvfp at

Claim 1

THE PROCESS FOR PRODUCING MINERAL WOOL INSULATION IN BOARD FORM POSSESSING A LOW DENSITY OF BETWEEN ABOUT 6 AND 25 POUNDS PER CUBIC FOOT, HIGH STRENGTH, FIRE RESISTANCE AND WATERPROOFNESS WHICH COMPRISES MIXING, WITH WATER, NODULIZED MINERAL WOOL, BENTONITE AND A SYNTHETIC THERMOSETTING CONDENSATION PRODUCT SELECTED FROM THE GROUP CONSISTING OF PHENOL-FORMALDEHYDE, RESORCINOL-FORMALDEHYDE, UREA-FORMALDEHYDE, AND FURFURAL-FORMALDEHYDE CONDENSATION PRODUCTS TO PROVIDE A SUSPENSION IN WHICH THE CONCENTRATION OF BENTONITE IS BETWEEN ABOUT 1% AND ABOUT 18%, BY WEIGHT, AND OF CONDENSATION PRODUCT IS BETWEEN ABOUT 1 1/2% AND ABOUT 20%, BY WEIGHT; CONTINUOUSLY FEEDING SAID SUSPENSION TO A CONTINUOUSLY MOVING SCREEN; DRAWING WATER FROM SAID SUSPENSION THROUGH SAID SCREEN WHEREBY THE MINERAL WOOL FIBERS, WITH WHICH BENTONITE AND CONDENSATION PRODUCT IN INTIMATE MIXTURE WITH EACH OTHER ARE ASSOCIATED, ARE FELTED INTO A THICK SHEET; DRYING AND HEATING SAID SHEET TO CONVERT THE CONDENSATION PRODUCT THEREIN INTO THE INSOLUBLE, INFUSIBLE, STATE.