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).
Machining and comparative strength tests of various insulating materials.
| Identifier | WestWitteringFiles\J\January1923\ Scan44 | |
| Date | 1st January 1923 | |
| To R.{Sir Henry Royce} A.{Mr Adams} R.{Sir Henry Royce} from EFC. c. CJ. & PHI c. Ey' & EP.{G. Eric Platford - Chief Quality Engineer} c. RC.{R. Childs} & DA.{Bernard Day - Chassis Design} ORIGINAL VARIOUS TESTS OF INSULATING MATERIALS. Below is a report of a number of tests of insulating materials which have been made from time to time:- (1) Machining Tests. (In this case we give an exact copy of Mr. Coverley's report). Ref Letter. Particulars. Remarks. B. Bakelite plate. Machines very good. C. Dielecto(brown) Good. D.{John DeLooze - Company Secretary} " (black) Good. F.{Mr Friese} Continental Bakelite (with linen matrix). Good. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Belmalite. Good. H.{Arthur M. Hanbury - Head Complaints} Diamond fibre plate.red. Good. I. " " " natural. Good. J.{Mr Johnson W.M.} Hightensite moulding. Good. K.{Mr Kilner} Isolite. Good. L. Litholite - grade CX.{Major Len W. Cox - Advertising Manager} This is very brittle when machining. M.{Mr Moon / Mr Moore} " - " P. Excellent to machine. Very soft. N. Siluminite - unfinished moulding. Good. O.{Mr Oldham} " - finished moulding. Machines moderately. P. Solidite. Moderate. Q. Stabalite red. Good. R.{Sir Henry Royce} Vulcanite rod. Good. (2) Comparative Strength Tests at atmospheric temperature of Bakelite, Elo and Mouldensite. In these tests the specimens were rods .600" square section. These were successively clamped horizontally at one end and loaded at the other end at such a distance as to provide a free length of overhang of 6", until fracture occurred. The loads necessary in the three cases were:- Bakelite 53 lbs. 14 ozs. Elo. 54 " 10 " Mouldensite 59 lbs. 6 " These figures lead to breaking tensile stresses of Baklite 8980 lbs/sq", Elo 9105 lbs/sq", Mouldensite 9897 lbs/sq" | ||