Saranac Laboratory Final Report to the Perlite Institute: Physical and Chemical Characteristics (1955)

This document is not about asbestos. It appears to be a Saranac Laboratory final report to the Perlite Institute. Its pages carry the date 3-19-55. It describes an animal experiment in which guinea pigs and rats inhaled perlite dust. Some animals inhaled the dust alone, others had dust plus an infection, and one group seems to have had infection without dust. The readable parts include tables of animals with a duration in months and a status, and charts of total lung silica over time. They also include a key defining F as fibrosis (collagen deposition) and S as stabilizing. Particle-size, quartz and chemical data for the dust also seem to be present. Much of the text is scanning debris, though some headings, captions, keys and status entries survive. In the table for the infection-plus-perlite group, several status entries read F=0 or S-1. These entries cannot be matched reliably to animals or durations. So no overall findings or conclusions can be reported, the F=0 entries do not show that the group had no fibrosis, and nothing about asbestos can be drawn from it.

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.

From J-M's medical library

This copy comes from the Johns-Manville medical library. It was among the papers J-M kept in its medical library without an index entry.

We publish this piece for research and commentary: it shows what the medical literature in a leading asbestos company's own library said on the subject, and when. Our summary above is our own reading of it. The copyright stays with the publisher.