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).
Test results comparing Hallowax impregnating compound to standard paraffin wax.
| Identifier | ExFiles\Box 61\1\ scan0151 | |
| Date | 4th December 1930 guessed | |
| WE.61. HALLOWAX IMPREGNATING COMPOUND. Leakage tests shewed the Hallowax to be slightly worse than standard i.e. .020 micromhos as compared with .004 micromhos at 100°C. As regards breakdown voltage the standard paraffin wax was also better giving 128 volts per mil as compared with 106 volts per mil for Hallowax. The important point about this Hallowax is its high melting point which we confirmed to be about double the value of standard wax i.e. in Centigrade degrees. HEWest. | ||