Tool design and press selection by ECL's engineering staff ensure optimal pressing efficiency. The mass-volume relationship of these compacted contacts is a key element of the quality of sintered contacts. Consequently, this process is closely monitored and subjected to statistical controls. Rotary presses, single die mechanical presses and hydraulic presses are all used to ensure appropriate densities are achieved for the wide range of contacts ECL supplies. The essential steps involved in the production of discrete sintered contacts through unit compaction powder metallurgy are compaction, sintering, infiltration, and solder flushing.