High-Copper Non Gamma II Amalgam Alloy Containing 69% Silver Type II Class 3 (Ag 69%, Sn 26%, Cu 4.5%, Zn 0.5%) Self Activating, Ultrasonically Welded Capsules. Nogama 2 is a blend of eutectic silver copper spheres & conventional lathe-cut particles. This 70% silver content alloy is characterized by substantially reduced corrosion and consequently reduced fracture. The positive setting expansion assures perfect margin integrity.