This Report Ho. 4 covers, the fourth period-, of the project, bat the duration of the project has been extended, to June 30,1963 by letter of 24 January 1963(Ref IKPR-33-A1K/33). In this period, two special modifi¬cations of the fluid, tetraisopropyltitanate/basic sincootoate reaction product have been developed, with the aim to produce increased- stability under the test requirements, for a hydraulic, fluid, while, maintaining the fire safety-conditions, which are outlined, in the preceding report. These products are modifications, of the product with tetra butyl tin and a modification of the product, with tri-isopropyl borate. Special attention has been given to the relationship between the diluted- mixtures of these products, using inhibited, silicone fluid 510 as diluents, and four-ball wear-test scar marks, and. also to viscosity changes, at low temperatures. The work is continuing.
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