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).
List of various insulation materials handed to RHC for experimentation.
| Identifier | ExFiles\Box 24\2\ Scan018 | |
| Date | 17th February 1920 | |
| X.1109 Ck{Mr Clark}/AT1/S17.2.20. X.1109. INSULATION. MATERIAL. The following material has been handed to RHC.{R. H. Coverley - Production Engineer} for experiment. 2. Pieces of Vulmos. - black and red. 1. Piece. " Isolite. 1. " " Diamond Fibre 2. Pieces." Robberine - Green and brown. Ck{Mr Clark}/AT. | ||