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).
Table detailing the material properties of special aluminium alloys (M.3, M.4, A.F.) at various temperatures.
| Identifier | ExFiles\Box 36\3\ scan 118 | |
| Date | 12th April 1927 | |
| Memo. O/T/H-298/12.4.27./A.W.H./M.H RE SPECIAL ALUMINIUM ALLOYS Designation. Temperature. Maximum stress Yield point. Elongation. Reduction in area. M.3 { 320°C. 7.2 6.4 6.0 5.1 { 270°C. 8.8 7.2 3.4 3.0 { 20°C. 10.4 9.2 1.5 1.5 M.4 { 320°C. 1.6 - 7.4 6.5 { 270°C. 2.0 1.5 7.5 6.2 { 20°C. 6.8 4.4 4.5 4.2 A.F. { 320°C. 2.0 - 5.9 5.4 { 270°C. 4.8 - 3.5 3.0 { 20°C. 7.2 4.8 1.5 1.5 | ||