Document 7M5XNNzaj539kVQyeaq9akyLE

Internal Correspondence To: K. L. Scheel - 230-B From: K. J. Pettera - 220-7W Subject: Date: October 6, 1980 3M Attached is a list of comparisons between charcoal tubes and the OVM done by Air Products and Chemicals. I've suggested the next time they use the OVM that we run comparisons in our lab. I'd appreciate your suggestions or comments. " // KJP:cb Attachments cc: R. J. Haggerty M. I, Merino 3M 109633 A cmct (%e*nica&- ALLENTOWN, PENNSYLVANIA 18105 23 September 1980 Mr. J. Kevin Duffy 950 North Kings Highway Cherry Hill, NJ 08034 j Dear Mr. Duffy: As you requested during your recent visit to Air Products, I am enclosing a list of comparisons between charcoal tube sampling and concurrent orgartic vapor monitor sampling. I hope this Information Ui11 be helpful to you. We will continue to do further testing of the OVM badge. JD:ko Enclosure ; Jo-Anne Dow j Industrial Hygienist 3M 109639 TOLUENE XYLENE METHYLENE CHLORIDE BENZENE PYRIDINE CHARCOAL TUBE 20 ppm 13 ppm H ppm j ppm 60 ppm 66 ppm 36^9 580 M9 247 /g 12\ 3/ig 3.b yg 4.3 xg 12.&><g 3.3t xg ! 6.flyg i 2.Vg i OVM 169 ppm 86 ppm 66 ppm 674 ppm 359 ppm 424 ppm 183x<g 232 ^g 1 32 /uQ 77 M9 2.6 /jg 3.1 ^g 5.4 jxq 2.3 ^ 9.9 /4g 10.3/tg l 3M 109640