Cork: Being the story of the origin of cork, the processes employed in its manufacture & its various uses in the world to-day

by Armstrong Cork Company

Mooring and Anchoring Buoys

The many different grades of granulated cork, made by grinding up cork waste, find a wide sphere of usefulness for packing and heat insulating purposes. In this last mentioned field, in fact, cork now ranks preeminent. Its peculiar structure, which may be seen under the microscope—myriads of sealed air cells, impervious to air and water—renders it not only a splendid nonconductor of heat, but also nonabsorbent of moisture.

Jar, Mustard, and Shell Corks

Ring Buoy

For loose filling between the walls of ice boxes, water coolers, and cold storage rooms, and about the sides of freezing tanks in ice factories, hundreds of tons of granulated cork are employed every year. Comparatively recently, however, an insulating material possessing permanency of form has been found desirable for many reasons.