Abstract: A method of producing laminated or sandwich type pipe insulation comprising compressing and reducing an outer fiberglass layer together with one or more mineral wool layers, both originally containing a resin filler or adhesive. The adhesive is selected from phenol or urea-type resins and more specially from phenol formaldehyde and urea formaldehyde resins. Heat and pressure are utilized to manufacture the laminate and the thickness of the fiberglass is reduced to 1/10 to 1/20 of its original size during the manufacturing. A temperature of 100.degree.-500.degree. F. is utilized and an exopressure of 50-1,000 psi is used. Particular pipe insulations produced are the specialty ells (L's) and tees (T's) made by the above process.