A method for fiberizing mineral material (18) with organic material (36) includes centrifuging mineral fibers (20) from molten mineral material (18) with a first rotating spinner (10), changing the direction of the mineral fibers (20) to form a downwardly moving veil (26) of mineral fibers (20), establishing a flow of molten organic material (36) moving toward a second rotating spinner (28) positioned within the veil (26), dividing the flow of molten organic material (36) into a plurality of streams, directing, by means of conduits (44), individual ones of the plurality of streams toward the peripheral wall (46) of the second rotating spinner (28), the conduits (44) shielding the molten organic material (36) from heat from the first rotating spinner (10), and centrifuging organic fibers (38) from the molten organic material (36).