This lower viscosity flowable flows easily, facilitating a smooth cavity lining. Together with its superb esthetics, excellent physical properties and quick curing time, ESTELITE® FLOW QUICK-HIGH FLOW enables the user to place quick direct restorations. This distinctive characteristic of quick curing is due to Tokuyama's patented innovatice initiator system "Radical Amplified Photopolymerization (RAP) Technology".