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).
Leakage conductance tests on various insulating materials.
| Identifier | ExFiles\Box 61\1\ scan0163 | |
| Date | 9th March 1931 guessed | |
| -2- (b) Leakage conductance tests (Circular electrode 1.00" dia) Material Leakage conductance at 80°C Leakage conductance at 100°C Redmanol (.058" thick) .003 micromhos .025 micromhos. Stokes 18/S S.L (.052" thick) .0005 micromhos .003 micromhos B.D.C. AL.229/31 (.061" thick) Not measurable .001 micromhos. Nestorite flow 15 (.061" thick) .001 micromhos .007 micromhos Nestorite flow 20 (.061" thick) .0005 micromhos .003 micromhos It will be seen that our standard Redmanol is the worst from the breakdown figures and also leakage. The best is British Dyestuffs with Stokes and Nestorite a close second. The price per lb. of these makes is approximately half what we pay for Redmanol so it seems that we have made a good discovery. EFC/H.E.West. | ||