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A two-page Johns-Manville internal memo of January 28, 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 January 24.
- Author
- D. R. Christensen
- Published by
- Johns-Manville
- Date
- January 28, 1974
- Number
- Bates S420-431–S420-432
- Library no.
- ACL Doc 25547 · asbestosclaims.law/library/25547
- 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, January 28, 1974 · 2 pages · 161 KB
What it shows
The R&D Center sampled five operations. Sanding 1-inch Marinite 36A with a Rockwell vibrating sander, exhausted to a Spencer portable baghouse, gave 0.8 fibers/cc at the operator. Cutting the same board with a 4¼-inch Rockwell Model 314 portable circular saw, also exhausted, gave 3.4 fibers/cc at the operator, over the 2.0 limit, while the area sample read 0.0. Three tests on Corspan, a J-M panel, cut with masonry and diamond blades and water dust suppression, gave 0.3 to 0.7.
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 Corspan.” January 28, 1974. Bates S420-431–S420-432. Johns-Manville. AsbestosClaims.Law Library, ACL Doc 25547. https://asbestosclaims.law/library/25547.
ACL Doc numbers and their short links never change. See how to cite the Library.
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