J-M Industrial Insulations to the National Sanitation Foundation Testing Laboratory on Marinite 36 (1957)

A one-page letter of October 22, 1957, from the product manager of J-M's Industrial Insulations department (initials W. G. H.) to Charles A. Farish of the National Sanitation Foundation Testing Laboratory at the University of Michigan in Ann Arbor. The writer says that Dr. Kenneth W. Smith of J-M "has replied to your question as to whether or not Marinite 36 is toxic," and encloses a brochure. It describes Marinite as both a structural and an insulating material, widely used to build ovens, driers and other heated equipment, including "a cookie oven."

In Johns-Manville's chronology

Johns-Manville's own chronology of what the company knew describes this document as follows:

Correspondence between J-M and Charles A. Farrish, National Sanitation Foundation Testing Laboratory, Inc., 10/22/57, responding in the negative to an inquiry as to whether Marinite 36 was toxic if ingested.

Editor's note: J-M's description says J-M answered in the negative whether Marinite 36 was toxic if ingested. This letter does not answer the question; it says Dr. Kenneth W. Smith "has replied" separately, and his reply is not in this file. The addressee's name appears to be Farish.