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Report No. 404-105 of the Johns-Manville Research and Engineering Center, dated March 30, 1972, requested by S. Speil and reported by R. M. Haller of the Materials Evaluation Section. Copies went to J-M's environmental, sales and research managers, including E. M. Fenner, G. L. Swallow and C. Sheckler.
- Author
- R. M. Haller
- Published by
- Johns-Manville
- Date
- March 30, 1972
- Number
- Bates S420-420–S420-422
- Library no.
- ACL Doc 25552 · asbestosclaims.law/library/25552
- Rights
- From the Johns-Manville archive (file S420, industrial hygiene surveys and dust counts). An internal company test report, republished for research and health-and-safety purposes.
Read or download
Read online Download the PDF Report No. 404-105 · 3 pages · 735 KB
What it shows
J-M cut Marinite 36 (a third amosite by formula) and Molten Metal Marinite (40% amosite), both made at the Billerica plant, with "a portable electric rotary hand saw ... with a 7-in. carbide-tipped blade," in a fire test room with only the outside wall fan running. The operator wore a personal sampler on his collar. It compared them with Thermobestos cut on a band saw with its exhaust on.
| Product | Total dust (mg/m³) | Fibers over 5 µm (f/cc) | Sample time |
|---|---|---|---|
| Marinite 36 | 11.5 | 126 | 20 min |
| Molten Metal Marinite | 37.2 | 315+ | 16 min |
| Thermobestos | 6.7 | 4.4 | 30 min |
| Thermobestos, heat-treated | not measurable | 0.8 | 22 min |
The report says Molten Metal Marinite "released three times more airborne total dust and fiber than MARINITE 36," and that the higher counts for the Marinites were "expected ... since no exhaust system was in the immediate vicinity." The federal limit at the time was 5 fibers/cc.
Related
- Marinite and the SS Morro Castle disaster, our guide to the product
Cited on this site
Cite this document
R. M. Haller. “J-M Research Center, "Thermobestos and Marinite: Fiber and Dust Release on Cutting".” March 30, 1972. Bates S420-420–S420-422. Johns-Manville. AsbestosClaims.Law Library, ACL Doc 25552. https://asbestosclaims.law/library/25552.
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