The spherical alloy that never needs polishing. Caulk`s firm packing, fast setting and smooth carving spherical alloy, Unison® assures a lustrous, long-lasting restoration without polishing.  It offers superior margin integrity. Unison® alloy is available in our patented self-activating capsules. Unison® Physical Description* Composition Silver Tin Copper Zinc Mercury Ratio 56.7% 28.6% 14.7% 0% 42% Particle Type 100% Spherical Compressive Strength (in PSI @ 1hr) (in PSI @ 24 hrs) 33,000 72,400 Dimensional Change (@24 hrs) -5.1 u/cm Flow (@24 hrs) .32% Creep (@ 7 days) .04% Condense Time 3:00 Set Time 3:00 Copyright 1997 DENTSPLY International 556013 (2/97) *Data on file