Brush production technology Description of different technologies used in brush production. Production technology of punched brushes It is the most efficient brush production which replaces technology called retraction. Production technology of retracted brushes The oldest brush making technology, where the filling material is manually attached to the drilled hole. Production technology of brush sealing strips Sealing strip brushes are produced by pressing the filling material into a metal strip. Production technology of twisted brushes Twisted brushes are made in such a way that the requested filling material is drawn between two twisted wires.