GC Fuji IX GP EXTRA is the latest addition to the well established family of glass ionomers that offer unsurpassed wear resistancy, compressive strength, and durability. GC Fuji IX GP EXTRA is the fastest setting glass ionomer on the market. While maintaining the ample working time of GC Fuji IX GP FAST (1 1/4 minutes), GC Fuji IX GP EXTRA allows final finishing in only 2 1/2 minutes from initial mix.The faster final set saves valuable chair time which provides improved stability against water, an important feature in challenging oral environments. This product contains a next generation glass filler, SmartGlass™. The filler elicits higher translucency, fluoride release, reactivity and a faster setting time.