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).
Analysis report detailing the chemical composition of sludge sample number 16628.
| Identifier | ExFiles\Box 150\1\ scan0028 | |
| Date | 18th July 1935 guessed | |
| -2- SAMPLE NO. 16628 - SLUDGE This sample consists of a dark grey oily paste containing minute fragments of white metal. It has the following composition:- Oil 30.0% Volatile Hydrocarbons and Moisture 3.5 Carbon 7.9 Insoluble Silica & silicates 4.5 Lead Oxide 18.5 Tin Oxide 4.2 Copper oxide 5.2 Iron oxide 14.3 Aluminium &/or chromium oxide 2.4 Zinc oxide Trace Calcium oxide 1.2 'Br' 2.4 'SO3' 3.7 Loss on Ignition (less Carbon) 5.2 The sum total of constituents exceeds 100 because all metals are expressed as oxides, whereas they are, to a considerable extent, present in the metallic state, e.g., iron, white metal fragments, etc. can be readily detected. (It should be pointed out that the aluminium and/or chromium was obtained by estimating the iron in the combined iron, alumium and chromium precipitate. Owing to the small proportion, no definite positive tests could be applied for these metals. It was considered unsafe, however, to ascribe the difference only to aluminium, since chromium was definitely detected in the lubricating oil ash. The proportion of aluminium, if present, is, however, much less than would have been expected from the report of the serious corrosion of aluminium plugs). | ||