A method for manufacturing a mineral fiber product (36) comprises establishing a stream of mineral fibers (18) directing polymeric fibers toward the stream of mineral fibers (18) to cause intermingling of the polymeric material, and applying heat to the polymer fibers (30) so that some of them become softened to the extent that they lose their fibrous form and become attached to the mineral fibers (18) as non-fibrous particles, whereas some of the polymer fibers (30) retain their fibrous form.
