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).
Informational leaflet about using 'RAD' branded Motor Glycerine as an anti-freeze in a car's cooling system.
| Identifier | ExFiles\Box 151\3\ scan0054 | |
| Date | 28th February 1929 guessed | |
| Prevention is Cheaper than Cure. Every driver of a motor car in the winter fears the possibility of the water in his cooling system freezing and landing him in heavy expenses owing to a cracked cylinder or broken radiator. Even the most dependable of cars are not free from climatic conditions, and if a car is left unattended on a very cold night, freezing can occur. In 1925 we put on the market the well known Motor Glycerine which is a special grade of Glycerine which can be employed as an anti-freeze with no fear of corrosion to any part of the cooling system. It does not destroy the finish of the car and it gives off no unpleasant odours or poisonous fumes. It cannot over-heat the motor. This Motor Glycerine has been used by discriminating motorists since its introduction three years ago, and in order to safe-guard motorists generally, so that they get the right article for their purpose, we are now marketing it under the name of “RAD.” RAD must not be confused with ordinary Glycerine. This latter material is often-times contaminated with salt and would have considerable corrosive action on the metal parts of the car. RAD will not evaporate. You don't have to put more in every time there is a cool snap. There is no need to guess whether it is up to strength or not. It never deteriorates. As long as your cooling system does not leak, you are absolutely certain of positive, permanent protection against frost. Why spend another winter worrying whether you may freeze up when for 12s. 6d. you can have full insurance against frost troubles. There is only one precaution necessary that is to make sure your cooling system is tight. Obviously no anti-freeze can protect your car if it is allowed to leak out, so make sure that your hose connections, gaskets, and pump packing are absolutely tight and that there are no small leaks. If you follow this simple direction you can then enjoy the pleasantest winter with your car that you have ever had. Methylated Spirit is effective, but it evaporates. RAD does not evaporate. It is only necessary to add water to make up for evaporation losses. Research shows that Glycerine and Methylated Spirit have about equal value in lowering the freezing point, as is shown by the following table: Per cent. by volume. Glycerine. Methylated Spirit. 10 29 °F 27 °F 20 21 °F 19 °F 40 0 °F 2 °F 50 -15 °F -18 °F This table shows that 20% by volume solution of RAD will give immunity to withstand 11° of frost, whereas a 40% solution will not freeze until zero temperature is reached. It is unlikely of course in this country that such an intensely cold temperature will ever be experienced. We have found from experience that the contents of the standard tin of RAD is sufficient for the ordinary cooling system of a motor car for use in this country, and once it has been placed in your radiator, you have rendered it unnecessary to empty the radiator during the whole of the winter. A mixture of 1 part of RAD and 2 parts of water will not freeze until the temperature falls to 32° of frost. RAD will ensure your car for 12s. 6d. for the whole winter against all damage that frost can effect. “RAD.” This is the trade mark under which Pearce’s Special Motor Glycerine is now marketed. Packed in tins sufficient for the average car for the whole winter. Used as directed it will ensure that the water in your radiator will not freeze and it is quite unnecessary to employ special heating devices to prevent freezing of the cooling system. | ||