Extremely large purity silicon for semiconductors is received using the Siemens approach; the silicon is reacted to make trichlorosilane, which happens to be first purified by distillation, then reacted with purified hydrogen on significant purity silicon rods at 1150 oC to produce significant purity, polycrystalline silicon with hydrochloric acid byproduct. https://cementtoglasslinedductile82469.thenerdsblog.com/42467179/property-type-tic-fundamentals-explained