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STEEL Metallo‐glass coatings These coatings have usually been formed from mixtures of finely‐dispersed powdered glass and chromium, but they have not been entirely satisfactory for protection against high temperature oxidation (up to 1000°C). Recent Russian work has been directed to the parts played by the metal component and the kind of glass used as binder. The chemical (oxide) composition of numerous binders or glasses used in the USSR were tabulated; also their surface tension and spreading properties on metal (drop spread in mm2 at 1300°C on chromium, nickel, steel). Data was obtained on the temperature of formation of coatings of pure binders and those containing fillers. Results vary widely according to metal and binder used. For example, binder No. 393, with surface tension at 1300° of 273.3 linear cm, shows maximum spread (143) with nickel, less with chromium (93) and with steel (73). No. 143 with surf. tens. of 75.3 has spread for Cr, Ni and steel respectively of 112, 123, and 109. The figures for both these binders much exceed those for other binders tested. Compositions are as follows: 393: oxides of Si (50), B (20), Ti (10), Ba (15).—E. A. Antonova, Zh. prikl. Khim., 1963 (8), 1637–1641.