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Development of three variants of electroinsulating barriers between liquid metal (lithium) and fusion blanket walls are described: (1) Two-layered or multi-layered metal-ceramic barriers obtained with deposition/spraying technique; (2) Ceramic and ceramic/metal-clad barriers; (3) Multi-layered metal-ceramic barriers obtained by baking technology. Results of preliminary tests-thermal cycling in vacuum at 20-650 o C and exposure in liquid lithium at 600 and 650 o C-are reported.