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 insulation materials and their suppliers for the Experimental Department.
| Identifier | ExFiles\Box 24\2\ Scan196 | |
| Date | 1st April 1922 | |
| X.1109 INSULATION IN EXPERIMENTAL DEPT. * = See supplement. PAGE: I MATERIAL | SUPPLIERS | ARTICLE | COLOUR OR GRADE | NO. | REMARKS --- | --- | --- | --- | --- | --- Bakelite | B.T.H. Co. Coventry. | Discs | Black | 2 | 2 Used (1 for test & 1 unit) " | Arch. Campbell. | Sheets | Brown | 3 | Used for expl units. " | " | Rod | " | 1 | " " | " | Tubes | " | 2 | " Bakelite-dilecto | R.R., U.S.A. (Cont. Fibre Co) | Plates | Black | 1 | Used test & expl units. " | " | Rods | Brown | 1 | Used expl units. " | " | Sheets | " | 2 | Used " " & test. Bakelite Micarta | " (Westinghouse Co.) | " | Black | 2 | Paper base. Test & unit " | " | " | Brown | 1 | " Beldalite | Beldam Tyre Co. | Raw strip | Red | 1 | " | " | Sheets | Brown | 4 | 1 Used for tests. " | " | Mouldings | " | 4 | One or Three with units Begeite | Electric & Gen. Works Ltd. | Plate | grade A | 1 | Condensite | Condensite Co. Sheffield | | | | *Condensite Celoron. | Diamond Fibre Co. | | | | see supple. Continental Bakelite | Continental Fibre Co (per RR) USA. | Plates | brown | 7 | 6 Used on expl units. 1 branded H.V. Willis IV-22. " | " | Rods | " | 2 | Used on expl units " | " | Sheets | " | 2 | " | ||