Tony Bengelis The Sport Plane Builder
see note page 182 All plywood firewalls,whether of the laminated built-up type,or of the single plywood web type should be overlaid and insulated with a 1/16-inch sheet of asbestos and a layer of .016 inch stainless sheet or galvanized sheet or ( fibrefrax, my add on) just remembered I had that Don Chisholm
