The aim of this work was to synthesize and investigate fusible borosilicate glazes with a high B/sub 2/O/sub 3/ concentration, and to develop a glaze composition with a firing temperature of 730-760/sup 0/ C for use in obtaining joints between platinum and the ceramic ''Sinoxal''. Nine glaze compositions were synthesized with increasing contents of B/sub 2/O/sub 3/ from 18.2 to 46.8, which corresponded to a reduction in the ratio SiO/sub 2/:B/sub 2/O/sub 3/ from 2.8 to 0.72. The components were ground, screened and batched. It was established that with an increase in the B/sub 2/O/sub 3/ content the loss in mass during boiling of the glass is at first reduced and then reaches a minimum (1%) with a content of 26-30% B/sub 2/O/sub 3/. The recommended fusible compositions, whose firing temperature is 720-760/sup 0/ C, are good wetting agents and adhere well to ceramic and platinum.