Document Z8n4Jvz87M6Qm7pyQZnEjQNnY

* St. Udi - General Office October 30, 1967 PIRELLI GENERAL LIMITED EASTLEIGH, S OUTH HAMPTON I IRE-RESISTANT, L1LUID-ITLLED CAPACITORS P. J . A. Mar eh LONDON H. S. Bergen - HBEJRC *G. R. Buduou C. R. Coleman - RUABON *** mr Mwwweewg stpcst *\V. R. Richard - W RICH D. Wood - BRUSSELS Before an*we ring your questions about Aroclor L42, which it to be explored to impregnate cable*, pleaee let me take up the matter of dodecylbensene. You tate that in England petroleum cable oil ha* been largely replaced with dod*cylbeoene. becau*e of improved stability, insulation properties, impregnation propertie*, etc. We are well aware of the** and additional advantage* of dodecylbensene a* a cable dielectric fluid. We constantly have in mind Monsanto's strong position for supplying dodecylbensene. The material i* being studied here in the State*, but to our knowledge has not yet found commercial us* for this purpose. If, a* you say, la England it ha* replaced petroleum cable oil, please indicate market volume, eale* price, and send us copy of the specifications for the dodecylbnnsene being so used. If this thing is going commercial, we need to consider establishing dodecylbensene as dielectric fluid offered by Monsanto. We have been aware of the effort to investigate the possibility of using Aroclor 1242 as a cable fluid dielectric in England, especially, to accomplish fire - re slstancs deemed essential in the specialty application you soom to have. This interest does not exist in our country. When wo being up consideration of Aroclor 1242 for cables in the U.S. A., the electrical people point out all of the things that could bo wrong with using Aroclor in cables. You mentioned the power factor requirement sought. It soom* to us almost unrealistic that you can deliver a power factor of 0. 1% at, say, 50 cycles and S5*C. Such a value could be obtained by the user employing effective refinement immediately prior to use. However, when noting the way this cable is to be made, there is much question as to whether such low power factor values could bo maintained In this process. W* appreciate your explanation that a permittivity of five, which is typical for Aroclor 1242, and which is much higher than the value for mineral oil, may bo acceptable because the length of the particular cable will be relatively very short. 0079165 HARTOLDMONOOQ4744 P. J. A. Marsh LONDON -2- Octobor 30, 19b7 This, of coarse, also asrvts to indicats that the market tor this type cable is highly specialised and limited. To give you sen* help on the questions about gas solubility, we rotor to Frank Clark's book. INSULATING MATERIALS FOR DESIGN AND ENGINEERING PRACTICE. J ohn Wiley and Sons. I believs that either you or Dave have this book. The solubility of air in Areclor 1254 is given on page 197. This indicates air solubility percent by volume, as being 2. 1% at 20* Ci 5ft at bO'Cs and Oft st 100* C. On page 204, gas solubility in traaetormar Pyranol is given. Expressing the results in percent by volume after the reduction of all gas values to 760 mm of pressure at 25*C., and the liquid volume to 25* C., the solubility of typical gaees in transformer Py ranol is given as follows: Carbon dioxide Air Nitrogen Hydrogen Chloride 71ft at 25* C. 5. 7ft 6.0ft 37. 8ft 47ft at 100* C. 4.9ft 4.0ft 50. 9ft While we do not seem to have similar data tor Aroclor 1242, the fore* going will give reasonable guidance. Best regards. /ecd Copy of call report P. G. Beaigttus 00791Mb HARTOLDMONOOQ4745