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 wear test on a non-metallic material named 'Densa'.
| Identifier | ExFiles\Box 141\3\ scan0154 | |
| Date | 14th February 1933 guessed | |
| REPORT OF WEAR TEST ON "DENSA" NON-METALLIC. Particulars of Pieces. Test Mark Dimensions Thickness Specific Gravity Before After Before After No. 1 3 x .750 .311 .299 1.61 1.55 No. 2 3 x .746 .316 .289 1.62 1.66 No. 3 3 x .748 .308 .293 1.59 1.65 No. 4 3 x .745 .315 .299 1.62 1.65 Average .312 .295 1.60 1.62 Average wear in inches = .017 Duration of Test = 4 hours Total area of test pieces = 8.967 sq. ins. Total absorption of work = 47,059,200 ft.lbs. = 5,248,042 ft/lbs. sq.in. Rate of absorption of work = 6.57 H.P. Wear Figure = .00336 RECORD OF WEAR TEST. Time Load Speed Temp. at Co-efficient of Friction hr. - hr. lbs/sq.in. ft/min. end °C Max. Min. Average 0 - 1 13.4 4659 65 .383 .316 .350 1 - 2 " 4653 66 .383 .316 .350 2 - 3 " 4653 74 .366 .316 .341 3 - 4 " 4653 76 .383 .350 .366 Average 4654 .351 | ||