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 of Prestone Anti-Freeze Mixture.
| Identifier | ExFiles\Box 151\3\ scan0139 | |
| Date | 29th January 1930 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} H11/HC.29.1.30. X1435. Laboratory. Report No. L1731. Re Prestone Anti-Freeze Mixture. This was found to be suitable for use in radiator systems to prevent freezing. It appears to be practically pure Ethylene Glycol, containing approximately 2% or 3% of water. The analytical results are as follows:- The substance was neutral in reaction, and contained no dissolved salts. Boiling Point 175° C rising to 193° C Freezing Point of 25% Solution well below 0° F Specific Gravity 1.11 at 15° C (Undiluted) Hl. HE | ||