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 from R. K. Dundas Limited discussing the temperature limitations and applications of a protective coating for exhaust systems.
| Identifier | ExFiles\Box 134\5\ scan0143 | |
| Date | 21th July 1939 | |
| 2 Messrs. Rolls Royce Ltd., 21st July, 1939. For instance, if the temperatures which are found in your exhaust system do not rise above 750 degs.C., we think the process would be entirely satisfactory, but with higher temperatures you would soon reach the melting point of aluminium, and if it was sustained for long periods we would expect to find the protective coating forming globules over the surface. We have also carried out similar treatments with zinc sprayed for marine fittings. In this case we sometimes buff the coating which gives a very much better finish than galvanising, and is considerably more durable. We should be glad to carry out the treatment of some parts for you experimentally, and we would feel in a much better position to recommend the process or otherwise, if you could let us have some further information regarding temperature conditions experienced. It is quite possible to weld after treatment but this loses the protective property and the actual weld itself would have to be re-treated. Yours faithfully, for R.{Sir Henry Royce} K.{Mr Kilner} DUNDAS LIMITED. MANAGING DIRECTOR. | ||