Insulation and insulating materials for use in electrical engineering, electric motors and electrical equipment, in particular slot insulation, coil insulation and insulation of wires, terminals and connectors, fireproof cables, electrical insulation components, electrical insulating panels, tapes, hollow sleeves, wraps, cuffs and films, ground mica as filler, flexible insulators of mica, mouldings of mica and reconstituted mica, electrotechnical laminates, fibreglass for insulation