Sag-resistant substrates and methods of preparing and using same

摘要

Described herein are substrates comprising: a core comprising a plurality of open cells; a first facing layer attached to a first major side of the core by a first adhesive; and a second facing layer attached to a second major side of the core by a second adhesive; wherein the glass transition temperature of the second adhesive is greater than the glass transition temperature of the first adhesive.