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 for the physical and chemical properties of various dielectric cable materials.
| Identifier | ExFiles\Box 52\1\ Scan128 | |
| Date | 1st December 1929 | |
| EFCA/ADS.12.29. contd. -2- (A) Physical and chemical tests of the dielectric. (B) Electrical tests (C) Chassis and subsequent tests. The details of the tests under Section (A) are as follows :- (1) Immersion in petrol for 100 hours, note effect and increase in weight, if any. Effect on Gloverite - swollen, conductor loosened. " " Super Glover - " " " " Helsby - swollen, inner sheath softened and sticky. " " Maconite - swollen. (2) Immersion in engine oil for 100 hours, again note effect and increase in weight. Effect on Gloverite - negligible. " " Super Glover - " " " Helsby - " " " Maconite - " (3) Temperature test in which the cable is maintained at a temperature of 150°C. at 4 hours, and the effect observed on the dielectric. The degree of inflammability is also observed by exposing a portion of the dielectric to a naked flame. Effect on Gloverite - surface cracks when bent into a loop. | ||