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 of anti-freezing compounds 'Zero', 'stop-it', and 'Prestone', identifying them as glycerine and ethylene-glycol.
| Identifier | ExFiles\Box 151\3\ scan0162 | |
| Date | 22th February 1932 | |
| LID{A. J. Lidsey} X1435 To Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} HL2/AG.22.2.32. Laboratory. RE - ANTI FREEZING COMPOUNDS. : Hs{Lord Ernest Hives - Chair}/Lid{A. J. Lidsey}3/WA.{Mr Wallis}15.2.32. We have analysed the samples of "Zero" and "stop-it" anti freezing mixtures. They are commercially pure glycerine. Glycerine does not cause any discaling of the cylinder water jackets, when put in the radiator water, but may loosen some of the rust owing to a higher boiling point. Ethylene Glycol will have the same effect. Moreover it is impossible to obtain an anti freezing compound which does not alter the boiling point. "Prestone" is merely ethylene-glycol. (Sample received two years ago) It would seem to us that glycerine and ethylene-glycol are the only possible compounds available. RECEIVED 1932 FEB 22 Hl. HE- | ||