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A one-page memo of December 30, 1958, from Johns-Manville's general headquarters to all industrial relations managers, by H. M. Jackson, manager of J-M's industrial health program, on applying the threshold limit values in Appendix II of the company's Industrial Health Standard Practices to mixtures of dusts and vapors. Noting that "there has been little research done on the synergistic, or combined effects of mixed toxic materials," Jackson set rules agreed with Dr. Kenneth Smith: a toxic substance making up 25 percent or more of a sample takes its own limit, several such substances take the lowest limit, and samples with less than 25 percent toxic material are to be evaluated one by one.
- Author
- H. M. Jackson
- Sent to
- All Industrial Relations Managers
- Published by
- Johns-Manville
- Date
- December 30, 1958
- Library no.
- ACL Doc 11430 · asbestosclaims.law/library/11430
- Rights
- Republished under fair use for research and historical study.
Read or download
Read online Download the PDF Memo, December 30, 1958 · 1 pages · 68 KB
In Johns-Manville's chronology
Johns-Manville's own chronology of what the company knew describes this document as follows:
Jackson memorandum to all I.R. Managers re TLV, 12/30/58, describes relevant standard where more than one toxic substance is contained in materials being sampled.
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Cite this document
“H. M. Jackson to All Industrial Relations Managers on Threshold Limit Values for Mixed Dusts.” December 30, 1958. Johns-Manville. AsbestosClaims.Law Library, ACL Doc 11430. https://asbestosclaims.law/library/11430.
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