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).
Engineering memorandum detailing the use and properties of Voco Anti-Freeze.
| Identifier | ExFiles\Box 151\3\ scan0202 | |
| Date | 4th December 1934 | |
| FORM C21-1396 AUTOMOTIVE LUBRICANTS DEPARTMENT. ENGINEERING DIVISION. VACUUM OIL COMPANY, LTD. CAXTON HOUSE, WESTMINSTER, LONDON. S.W.1. ENGINEERING MEMORANDUM Voco Anti-Freeze The recommended anti-freeze solution for use in the British Isles is 20%, or one part of Voco Anti-Freeze to four parts water. A higher proportion of Voco Anti-Freeze may be used in extremely severe weather. The normal 20% mixture remains completely fluid down to 19°F.{Mr Friese} At this temperature a soft mush forms, but this cannot possibly cause cracking of the water jackets or radiator as it remains plastic down to very low temperatures. A more concentrated solution, such as 33 1/3%, or one part Voco Anti-Freeze to two parts water, remains fluid down to 6°F, and then forms soft mush, as described above. The main constituent of Voco Anti-Freeze is a very high quality of glycerine, which must not be confused with commercial grades of glycerine. It has no corrosive action on metals, nor on rubber water joints. Voco Anti-Freeze is pink in colour. Whenever an anti-freeze preparation is employed, it is desirable to flush out the cooling system with water to remove impurities and deposits. Also attention must be given to water joints, etc., to make sure these do not leak, as all anti-freeze solutions are more prone to leakage than is water alone. VACUUM OIL COMPANY LIMITED Chief Engineer AD/LEB 4-12-34 | ||