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).
Laboratory test report on two samples of Brittan's plain white paper impregnated by Messrs Symons for insulation properties.
| Identifier | ExFiles\Box 61\1\ scan0212 | |
| Date | 1st October 1932 | |
| X6110 BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Wst. c. BY/RD. c. ROY{Sir Henry Royce}/MS. Hs{Lord Ernest Hives - Chair}/Wst.1/KT.1.10.32. INSULATION TESTS ON BRITTAN'S PLAIN WHITE PAPER IMPREGNATED BY MESSRS SYMONS. We have now completed laboratory tests on two samples of this paper received by us for test from Messrs Symons. We give below Results of resistance insulation tests with temperature and breakdown voltage. (1) Brittans U.14 plain paper waxed by Symons. This paper was found to have a breakdown voltage of 590 volts per mil. This is extremely poor and is well below our specified standard. The leakage of this paper with temperature was also very poor, a maximum of .15 micromhos being obtained at 100°C. We do not recommend this paper under any conditions either for use with condensers or ignition coils. (2) Brittans 321521 paper impregnated by Symons. This paper proved to be a very good sample the breakdown voltage being 1500 volts per mil, the leakage being well within our specified limits. We recommend this paper to be adopted on production for use with both condensers and ignition coils. Compared with L.P.S. paper, which we had some time ago, this sample of Brittans paper is very good, and we would like to have a further sample for test in order to confirm the results we have obtained already. Owing to the fact that the papers we have received from Messrs Symons have always given inconsistent results, and have often been found with puncture holes, we recommend that we have for test occasionally, samples of this paper from production stock as it is being used, in order that a constant check may be kept on the consistency of insulation properties. We make these remarks because we are not sure whether the damage of the paper is caused during the waxing process or whether it is an inherent quality of the paper manufactured. Hs{Lord Ernest Hives - Chair}/Wst. | ||