ASTM C1921

Full Name

ASTM C1921 – Standard Test Method for Comparative Impact Testing of Gypsum Panel Outside 90° Corner Systems


This test method details the method for a laboratory-based evaluation of aesthetic damage caused to a non-structural gypsum panel outside 90° corner system when impacted by a hard body.

This test’s purpose is to provide comparative information on different gypsum panel corner systems to demonstrate aesthetic robustness and durability by minimizing initial damage.


corner apex; corner bead; corner damage; corner protection; corner system; corner tape; corner trim; cracking; external corner; hollow corner; impact performance; joint compound; outside 90°; overlapped corner