In the first campaign, the durability of the lining made of the experimental Kor-93 blocks, even in the most unfavorable service conditions, was over 50 meltings to the first repair. Thus cast corundum products of special shape proved to be the best of the tested materials with respect to durability in PVSC, taking account of the feasibility and cost of producing them. Further investigations are being made in order to improve the technology of vacuum treatment and the design of the vacuum chamber, and in order to reduce the standstills of the plant between melts; new types of refractory materials are being tested. LITERATURECITED

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