D2858-70 – Standard Test Method Technical Guide

📐 Scope and Significance of the ASTM D2858-70 Method

The ASTM D2858-70 (Reapproved 1997) standard presents the methodology for determining the thermal conductivity of compacted, granular, electrical grade Magnesium Oxide (MgO). The test procedure simulates the operational environment of tubular heating units, where MgO serves as a critical insulating material. The standard explicitly states that