Description:04 04 22 00 Holland. Industry of glass wool for insulation of houses. Lorry pours boiling liquid looks like the lave. Report on various stages of manufacture. Mixture of minerals and several other elements. Minerals are transported by wagons and melted in tub, Close-up boiling jets. Close-up glass wool which goes out of the press. Close-up worker. The glass wool is compacted in rollers. Seen in store with rollers. Close-up man who a woolen handle, looks like the cotton candy.