SVM - Tops and Tails

Tops and Tails are derived from a fully-grown polysilicon ingot.  Once fully grown, an ingot is removed from the quartz crucible from which it was pulled. Because the ingot was pulled at various speeds during growth, the ends are narrower than the silicon body. The narrow sections of the ingot are removed from the cylindrical body. These ends can be re-melted and used again in the growing process.