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).
The heat and flammability tests of Maconinte H.T. Ignition Cable compared to a standard cable.
| Identifier | ExFiles\Box 168\1\ img038 | |
| Date | 19th May 1926 | |
| WB.{Mr Brazier/Mr Bell}86. 19.5.26. MACONITE H.T. IGNITION CABLE. Owing to certain queries as to the behaviour of this cable under conditions of extreme heat, and its inflammability, tests have been mde with samples of our own standard cable and Maconinte with a view to determining this. Accordingly two samples were sent to the laboratory and exposed in an air bath at 200°C for 30 mins. and we attach their report HL2/EAL7.5.26 on the same. At the same time we placed a sample of each cable in our electric oven and allowed to bake for several hours with the oven temperature maintained at approx. 100°C. Upon examining the samples after this test there did not appear to be any change in either sample except that the Maconinte appeared rather softer. With reference to PN{Mr Northey}2/DN14.5.26 we do not consider that there is any difference in the inflammability of Maconinte as compared with our standard cable. Both samples were exposed to a naked flame and ignited fairly easily, both burning slowly with the same intensity. As regards the conductor becoming eccentric we do not consider that there is any liklihood of this occurring with temperatures up to 300°C or 400°C. In conclusion there does not appear to be much difference in the behaviour of either cable under extreme temp. conditions, but the balance might be in favour of our present standard cable. EFC/H.E.WEST. | ||