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 to the Vacuum Oil Company detailing the results of corrosion tests on 'EP' oils with various metals.
| Identifier | ExFiles\Box 145\2\ scan0258 | |
| Date | 3rd April 1939 | |
| Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}5/MH.{M. Huckerby} O.T.Jones, Esq., Vacuum Oil Company Ltd., Caxton House, Westminster, LONDON, S.W.1. 3rd. April, 1939. Dear Mr. Jones, I am sorry I have not answered your letter before but the tests on various 'EP{G. Eric Platford - Chief Quality Engineer}' oils are only just finished. Our findings as regards corrosion are based on the amount of deposit formed after 24 hours' immersion at 120°C. These measured in milligrams per square centimetre of surface are H.G.L. GX. Phosphor Bronze 20 24 Alum bronze 0.9 2.1 Mild Steel 0.004 0.12 Stainless Steel Stain 0.03 "Hi-Press" gives figures about one fifth of those for GX. We find GX to contain 1.85% of Sulphur Chloride which, in our opinion, is unnecessarily high. | ||