Abstract: A machine for slicing matting of brittle fiber material comprising an elastomeric coated anvil roller and a slicer roller having a plurality of cutting discs mounted on an axis parallel to the longitudinal axis of the anvil roller, which depress the matting into the elastomeric material of the anvil roller sufficiently to break the brittle fibers. The sliced matting can then be conveniently cut transversely on the same machine, if desired, to form diced brittle fiber matting. The diced matting, e.g., of fiberglass is a way of facilitating the separation of short fibers from fiberglass matting to produce raw material for forming new matting, or the diced brittle fiber matting, e.g., fiberglass or carbon fiber matting may be used as such.