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).
Laboratory report on the analysis and effects of reusing different types of glycerin in radiator systems.
| Identifier | ExFiles\Box 27a\3\ Scan081 | |
| Date | 20th November 1929 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} H12/HEG20/11/29. X4516. Laboratory. Re use of Glycerin in Radiator Systems. Pure Glycerin. Boiling Point 290°C Sample of Glycerin in Laboratory, supposed pure. Boiling Point 210°C, rising to 250°C after five minutes boiling. Commercial Glycerin. Sample supplied by Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Boiling Point 160°C, rising to 250°C after twenty minutes boiling. Darkening and Decomposition commence at 100°C. Residue on Burning -------Trace. Acidity -----------------Slight, equivalent to 0.01% Sulphuric Acid. Dissolved Substances -----Negligible. Sample as above after use in Radiator System. Boiling Point 190°C, rising to 250°C after ten minutes boiling. Suspended Matter -------Approximately 0.02% Iron Oxide. Dissolved Substances --Negligible. This used glycerin was of a dark colour, due to decomposition on boiling. Deposit removed from Cylinder Block after use of glycerin in system. Analysis showed this to be "dehydrated cylinder block corrosion product". The difference in boiling points between the various samples of glycerin is attributable to the presence of water as an impurity, water having a very marked effect. The loosening of the rust from the cylinder block is undoubtedly due to the dehydration which has taken place. This may have been effected by extraction of water by the glycerin, or, more probably, it is due to the decomposition of the hydrated oxide at the higher temperature to which it has been subjected. Possibly it is due to the combined effect of the two reactions. HE | ||