Silicosis And Asbestosis

Our plain-English summary of Silicosis And Asbestosis (1934).

The study

• Published: Chemical Trade Journal 95:92, August 10 (1934)
• Type of article: Trade journal article
• Our copy: from Johns-Manville's own medical library, J-M no. 003264. The article is still under copyright, so we describe it here rather than post it.

In plain English

This was a short, unsigned editorial note in the Chemical Trade Journal of August 1934, not a research study. It said that medical opinion, as shown at a recent discussion held by the Institution of Mining Engineers, was still far from unanimous about the causes of silicosis and asbestosis. Factory Inspectorate records showed 53 deaths from asbestosis and 469 deaths from silicosis, with and without tuberculosis, during the past few years. These counts covered only cases where the cause of death was not in doubt, most with a post-mortem examination. It hoped that new regulations for the asbestos industry, the pottery industry and others would markedly reduce these diseases. It also described a preliminary inquiry in the Factory Inspector's report for 1933 into french chalk, a hydrated magnesium silicate. The few examinations made found no appreciable disablement after exposures of nine to thirty-two years. It concluded that, on balance, french chalk had by no means the fibrosis-producing power of asbestos dust under ordinary industrial conditions. It noted that the literature on whether french chalk could cause a diffuse fibrosis was remarkably scanty.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Unsigned editorial note in a trade journal, reporting official records and a Factory Inspector's preliminary inquiry; not an original study
• Who was studied: No study population of its own. The article cites Factory Inspectorate death records from the past few years and a preliminary inquiry into french chalk recorded in the Factory Inspector's report for 1933. The number of workers examined in that inquiry is not given.
• Exposure: Dusts causing lung fibrosis: free silica (silicosis), asbestos dust (asbestosis), and french chalk, described as a granular form of talc or steatite that is essentially a hydrated magnesium silicate. No asbestos fiber types are named.
• Main results:
  • Medical opinion was described as still far from unanimous on the causes of silicosis and asbestosis.
  • Factory Inspectorate records showed 53 deaths from asbestosis during the past few years.
  • The same records showed 469 deaths from silicosis, both associated and not associated with tuberculosis.
  • The death figures covered only cases where the cause of death was not in doubt. In most of these cases a post-mortem examination had been made.
  • The article hoped that new regulations for the asbestos industry, the pottery industry and others would markedly reduce the incidence of these diseases.
  • In the french chalk inquiry, the few examinations made did not show any appreciable disablement after exposures ranging from nine to thirty-two years.
• The authors' conclusion: The article concluded that, on balance, french chalk has by no means the fibrosis-producing power of asbestos dust under ordinary industrial conditions.
• Limitations the authors state:
  • The literature on the possibility of french chalk causing a diffuse fibrosis was described as remarkably scanty.
  • Only a few examinations had been made so far in the french chalk inquiry.

Topics

Medical terms in this study, explained in our Lexicon: Silicosis, Autopsy, Silicate, Fibrosis.

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