Crucibles used for melting 25 charges of silicon for single-crystal growth are made of the purest grade of fused silica and have the shape of a rounded cup with a flat bottom. The wall thickness is ~6...

Crucibles used for melting 25 charges of silicon for single-crystal growth are made of the purest grade of fused silica and have the shape of a rounded cup with a flat bottom. The wall thickness is ~6 mm and the maximum crucible diameter is —25 cm. Suggest a way to make these crucibles.