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A one-page Johns-Manville internal memo of March 7, 1974, a memo from D. R. Christensen to P. L. Earle, both of J-M's Research and Development Center in Manville, New Jersey, with copies to D. E. Hillier and G. L. Swallow at headquarters. Prepared by T. F. Antonson; the samples were taken February 21. The page is marked "Denver Research" and carries a microfilm frame label.
- Author
- D. R. Christensen
- Published by
- Johns-Manville
- Date
- March 7, 1974
- Number
- Bates S420-435
- Library no.
- ACL Doc 25548 · asbestosclaims.law/library/25548
- Rights
- From the Johns-Manville archive (file S420, industrial hygiene surveys and dust counts), produced in litigation (stamped "PRODUCED JM-83"). An internal company test report, republished for research and health-and-safety purposes.
Read or download
Read online Download the PDF Memo, March 7, 1974 · 1 pages · 164 KB
What it shows
The R&D Center tried five saws on 1-inch Marinite 36A and ½-inch Transite. Only one was sampled: a 7¼-inch Skilsaw cutting Marinite over a vacuum table exhausted to a Spencer portable baghouse, which gave 7.3 at the operator and 38.7 in the area, against the 2.0 limit (the memo prints no unit; the series reports fibers/cc). The memo says that "because of the visible airborne dust generated by the last four saws ... it was determined by the Hygienist and M. F. Trosper that more modifications were needed," and "samples were not set up on the last four saws."
It is one of a series of 1973–74 sawing tests at the R&D Center that tried to bring Marinite cutting under the new 2.0 fibers/cc limit; see Marinite for the series.
Related
- Marinite and the SS Morro Castle disaster, our guide to the product
Cited on this site
Cite this document
D. R. Christensen. “J-M R&D Center, Sawing of Marinite 36A and Transite with Different Ventilation Systems.” March 7, 1974. Bates S420-435. Johns-Manville. AsbestosClaims.Law Library, ACL Doc 25548. https://asbestosclaims.law/library/25548.
ACL Doc numbers and their short links never change. See how to cite the Library.
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