Physical and biological characteristics as well as the clinical behavior of a new powdered alloy mixture (ISO 1559--1978) for the demonstration of a gamma 2-free amalgam were studied. The physical values surpassed the requirements of the Preliminary German Industrial Standards No. 13904. Compared with other gamma 2-free types of amalgam, the structure of the amalgam composed of the alloy under study contained no additional copper-containing phases which would negatively influence electrochemical events within the amalgam structure, except for the eta'-phase. Implantation tests with rabbits showed that the amalgam composed of the material under study reacted like material tested in earlier investigations which is already available.