For this purpose blasting powder of "low" brisance is necessary. EGDN has a slightly higher brisance than nitroglycerin. The value of brisance depends on the application. The most common use of PETN is as an explosive with high brisance. In a pinch the Winchester WLRM primer or primers with similar brisance may be substituted. An important aspect of ERA is the brisance, or detonation speed of its explosive element. It has a very slow decomposition rate, and therefore a very low brisance. Brisance values are primarily employed in France and Russia. TNT has higher explosive velocity and brisance, but is deficient in oxygen. Brisance is the shattering capability of a high explosive, determined mainly by its detonation pressure.