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A one-page Johns-Manville internal memo of November 30, 1973, 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 K. J. Williams.
- Author
- D. R. Christensen
- Published by
- Johns-Manville
- Date
- November 30, 1973
- Number
- Bates S420-427
- Library no.
- ACL Doc 25544 · asbestosclaims.law/library/25544
- 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, November 30, 1973 · 1 pages · 141 KB
What it shows
The R&D Center sawed and drilled 1½-inch Marinite 23A sheets on a table, with each tool connected to a Spencer portable baghouse through a 1½-inch hose. Sawing gave 177.7 fibers/cc at the operator and 68.0 five feet away, against the 10 fibers/cc ceiling for short peak samples; the memo says only 15-minute samples were taken "due to heavy airborne dust observed." Drilling gave 2.5 fibers/cc at the operator, over the 2.0 limit, and 1.4 nearby.
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 and Drilling of Marinite 23A.” November 30, 1973. Bates S420-427. Johns-Manville. AsbestosClaims.Law Library, ACL Doc 25544. https://asbestosclaims.law/library/25544.
ACL Doc numbers and their short links never change. See how to cite the Library.
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