| abstract |
The invention relates to a process for the manufacture of pencil leads from clay, graphite and optionally other products, the clay or the clay-graphite mixture being attacked by water, coiled, dried and calcined. . This process is characterized in that, prior to the attack of the clay or of the clay - graphite mixture, or with a view to this attack, one or more alkaline phosphates, one or more alkaline borates and / or one or more alkali carbonates. Application to the manufacture of charred pencil leads. |