Historically GT sold Sapphire furnaces with seeds as part of the performance warrantee. They would only honor performance issues if GT seeds were used. The cutting of the seeds uses standard cutting equipment...what is critical is the orientation of the crystal lattice to the cutting plane. I believe that they use xray diffraction and polarized light for orientation. I understand that they would get out of custom coreing and waffering activity but seeds seem to be pretty integral to furnace sales unless they change their business model.
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