Powdered material based on inorganic loads designed for treating the joint resulting from the connections between square edge boards in Pladur® plasterboard systems used in the construction of walls and ceilings. It has the required additives for mixing with water prior to installation at the work site. It is primarily used in Pladur® FON+ ceiling systems, although it can also be used in other applications if the necessary installation instructions are followed. It is a setting compound, with a predetermined time in which it can be used (approx. 1 hour).