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).
New 'Wilderman separator' made of spongy porous ebonite, its properties, and comparison to other battery separators.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan142 | |
| Date | 9th July 1930 | |
| -2- ERC/AD9.7.30. contd. Recently, a new type of separator known as the Wilderman separator has been produced which consists entirely of spongy porous ebonite. This is claimed to have a far greater effective area of porosity than any other type of separator, and it certainly appears likely that it should be far superior to the threaded rubber separators of which great things were claimed but which have not appeared (from our own tests) to turn out very well, being good for a time only and then apparently increasing their through resistance. So far we have had no Wilderman separators in batteries for test but it is now the case that the Young Accumulator Co. (1929) Ltd. have incorporated the Wilderman separator in the manufacture of their products having obtained a licence and installed plant to manufacture Wilderman Porous Ebonite Separators under Dr. Wilderman's patents. The advantages claimed by the use of porous ebonite separators are as follows :- Physical Properties. (1) The separators are of moulded ebonite and can be made in any shape, form or thickness and adapted to any special requirements for all types of batteries. (2) The separators can be made of any porosity up to 70%. By this is meant that the ratio of the total volume of the capillaries to the total volume of the separator is 70%. | ||