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).
Results of a heating test on specimens of Black and Brown Mouldenite, detailing weight increase and physical degradation.
| Identifier | WestWitteringFiles\I\September1922\ Scan68 | |
| Date | 10th August 1922 | |
| RR 238 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To E.F.C. Order No P.B. 45. Customer's No. X 1109. Specimen | Wt. Before | Wt. After | % Increase --- | --- | --- | --- do. | 9.13 gms | 9.22 gms | .986 Black Mouldenite | 5.45 " | 5.50 " | .918 Brown Mouldenite | 8.55 " | 8.62 " | .819 (3) Generally, their behaviour on the heating test was as follows. They commenced by a greasy vapour forming on the surface, as though some resinous substance in the material was being melted and was oozing out. At the same time the specimen got a little softer. As the temperature rose this substance expanded under the surface, forming blisters. After a time these blisters cracked, and the specimen began to char. When cold it was found to be dry, and more easily broken, while the grain of the material at the break appeared to have become much coarser. Signed Cont'd This Sheet must be filed on completion of the work. | ||