Document O6XD5jyZdj7NDNjQnYr6ZjbQ

*' *' M onsanto Chemical C ompany St . Lotrzs 4 . Msssocstz July 25# 1956 Mr. E. V. Speicher, Administrator Industrial Hygiene Westinghouse Electric Corporation East Pittsburgh, Pennsylvania Sear Mr. Spelcher: Ciank you for your letter of July *19 requesting toxicity Infor mation on several of our Arodors and atmospheric sampling methods I am sending under separate cover two detailed reports published by personnel at the Kettering Laboratories entitled, "The Toxicity of the Vapors of A r o d o r s 1242 and 1254." Cie data contained herein were condensed and presented oy fir. Treon at the A2HA meeting In Philadelphia this year. It was published In the form presented in the June, 1956 Issue of the "AIHA Quarterly," a copy of which I am sure you must have. I am asking Sr. Treon, .by a copy of this letter, to send you a reprint of his publication If such Is available at the present time. You will note that Sr. Treon has proposed that the hygienic stan dard for Aroclor 1242 be tentatively established at 2 milligrams per cubic meter and that the standard for 1254 b e estSIiSh at ~ milligram* cer cubic meter. I am sorry that we do not have similar data on Arocior 120U. However, we have no particular reason to expect that a 6~Per cent chlorinated biphenyl offers any greater hazard than a 54 -per cent chlorinated biphenyl. You will note further that Sr. Treon's work discusses a modified Willson hydrocarbon apparatus used In the sampling of his test atmospheres. In a limited amount of sampling In our own plants we have used the Willson equipment as shipped to us. I have en closed a description of the operating procedure prepared by one of our research groups which Is somewhat more detailed than that provided with the Instrument. You have previously seen our complete reports on the decomposition of Pvdraul when allowed to drip or flow onto a heated metal Inconel surface. Ifce data in those reports have convinced us that there is no greater acute hazard should Pydraul accidentally contact metals at the temperatures Investigated than there would be with other industrial hydraulic fluids. I do not have any* data to support any conclusions as to what might occur If the Pydraul were to be used PLAINTIFF'S EXHIBIT 906235 GBRN003396 / Mr. E. W. Speicher, Administrator -- Page 2 -- July 25 1956 as a hydraulic fluid In m alting magnesium d ie e a s t i n g s . Ve .do have a report that one plant "handling large quantities of molten magnesium purposely sprayed Pydraul Into .the molten material primarily to see If there would be a great deal of spattering of the magnesium. She company reported to us that *their tests convinced *them that Pydraul could be used. Whether or not they are using* Pydraul Z cannot say. Z not In rereading your letter that Z have sot answered your' question relative to akin effects following Aroclor contact. .We recommend that repeated and prolonged akin contact with any of m e Arociors oe avoided, we nave patch tescea several of them with"1negative resulta. Zn addition reported eases of . - skln Irritation have been surprisingly few In view of the heavy tonnage quantities of Aroclor manufactured and handled In the % last twenty years. **We believe, however, that care In handling' and good personal hygiene Is necessary to avoid Irritation.... As with many chlorinated hydrocarbons, exposure to* sufficient * quantities over a long enough period of time could eoncelvably result In* chloracne. in this respect, however, the Aroclors are no the potent chloraceneeens . such.as chlorinated naphtha lenes ^ To our knowledge, there have never' beefl thy cases"dl chloracne in the electrical Industry's use of these products. If 1 can be of any further assistance, please let am know. Very truly yours. E?W:SM3 Enclosure cc Dr. Joseph F. Treon The Kettering Laboratory Mr. Paul G. Benlgnus Monsanto ir . Wheeler Assistant Director Medical Department 906236 GBRN003397 r