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 log for various moulding materials under speed and temperature stress.
| Identifier | ExFiles\Box 50\5\ Scan131 | |
| Date | 29th June 1922 | |
| Top of page: n4323 E.7c. COLUMN HEADERS: Date of test. | Moulding material. | Ref: | Carcase temp. reached previous to speed burst. °C | Test speed. r.p.m. | Duration of test speed. | Result. | Further remarks. TABLE DATA: Date: 23.6.22 1. Asbestos Elo. | a | 120 | 6250 | 2 mins. | Burst. | Only ferrule remained on shaft spindle. 2. " | b | 100 | 6000 | 3 " | O.K. | (N.B. It being understood that the figures given for the comm. which remained O.K. refer to a continuation of the test after the first comm. had burst, so that really the second comm. was subject to both these tests). Date: 24.6.22 1. Asbestos Elo. | b | 100 | 6000 | 3 " | O.K. | 2. Plaine " | c | 100 | 6000 | 1/2 " | Burst | Moulded core remained on spindle, but was cracked long. Date: 27.6.22 1. Asbestos Elo. | b | 93 | 6000 | 1/2 " | O.K. | 2. Mouldensite. | d | 93 | 6000 | 1/2 " | Failed.| 6 segs: only flew out. Date: 27.6.22 1. Asbestos Elo. | b | 83 | 6000 | 3 " | O.K. | 2. Mouldensite.* | e | 83 | 6000 | 3 " | O.K. | Date: 28.6.22 1. Ditto (Continuation) | b | 100 | 5500 | 1/2 " | O.K. | 2. Ditto. | e | 109 | 5500 | 1/2 " | Failed.| 6 segs. flew out. Date: 28.6.22 1. Asbestos Elo. | b | 105 | 6000 | 1/2 " | O.K. | 2. Bakelite. | f | 105 | 6000 | 1/2 " | Burst. | Only moulded core remained. Date: 29.6.22 1. Mouldensite.* | g | 100 | 6200 | 3 " | O.K. | Speed momentarily obtained 6420. 2. Plain Elo. | h | 100 | 6200 | 3 " | O.K. | Date: 29.6.22 (handwritten) 1. Mouldensite. | g | 110 | 6100 | 1/2 " | Burst. | Moulded core remained on spindle 2. Plain Elo. | h | 110 | 6100 (crossed out) 6000 | 1/2 " | O K | 3. Plain Elo. " | h | 107 | 6000 | 3 " | O K | | ||