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).
Report comparing the effects of high temperatures on bakelite and vulcanite materials used for wiring tubes.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan042 | |
| Date | 23th May 1930 | |
| EFC/AD23.5.30. contd. -2- After one hour at 200°C, the colour of the bakelite changed to dark brown but otherwise there was no appreciable effect. Upon raising the temperature to 250°C. cracking noises were heard coming from the tube and upon examination at the end of one hour the tube was found to have turned nearly black in colour being blistered on the surface and very brittle showing that the bakelite was nearly carbonisation point. In comparison with this a sample of the Vulcanite covering as applied to wiring tubes which have been used on Phantoms --- enamelled aluminium wiring tubes are now on test for adoption --- was also similarly heated. At 150°C, the vulcanite became very soft and could easily be bent through 90°. At 200°C, the vulcanite practically melted being very plastic and completely blistered and distorted. EFC. | ||