From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Letter from C.C. Wakefield & Co. Ltd discussing the properties and applications of Castrol Hi-Press and Hypoy lubricants.
| Identifier | ExFiles\Box 145\2\ scan0144 | |
| Date | 28th May 1937 | |
| -2- Messrs. Rolls-Royce, Ltd. 28th May, 1937. For most purposes Castrol Hi-Press as now constituted meets the general requirements. Naturally there must be some little overlapping when a new product is superseding an old one. Actually at the moment we only use the thio-ether product for Works use. This is simply due to the fact that we are installing a large scale apparatus for making the material on a production scale. We hope to make the transition in the course of the next week or two, so that the lubricant will be generally available to the garages and through them to the motoring public. It will be sold under the name of Castrol Hi-Press. Hypoy is a different material altogether, and is intended for a different set of conditions. It was evolved last Autumn to meet the demands of the American car manufacturers who introduced exceptionally high loading on the hypoid gears of certain cars. In order to meet this extra loading it was necessary to use a very active sulphur compound, so active that it is only safe to use where the construction is wholly steel, and so far as we know where the ball races do not come in contact with the lubricant. We believe that the temperature at which it can be operated must essentially be lower than for Castrol Hi-Press. The sole object of Hypoy is to provide a lubricant to withstand a very high loading, quite irrespective of the other features which we have mentioned. We should not recommend Hypoy in the presence of copper alloys. Yours faithfully, C. C. WAKEFIELD & CO. LIMITED. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} Evans CHIEF CHEMIST | ||