Toner fusing is a critical step which determines both the quality of printed image and the amount of energy consumed by a laser printer. Therefore, manufacturers of laser printers and toners constantly work on improving fuser units and designing new toner formulations. It turns out that the external additives, which are primarily used to improve toner electrostatic charging, flowability, and durability, also affect toner fusing [1]. For instance, when used at relatively high loading treated silica affects toner melt flow behavior by increasing viscosity of melted toner. If viscosity of melted toner is high this results in inefficient flow of toner and poor fusing. Some toner manufacturers have begun using new external additives which enable fusability at low fusing temperatures. Silica composite particles - a new class of materials that was developed by Cabot Corp. for application in laser printer toners [2-4]. At the NIP29, we discussed how this material is synthesized and how it improves toner durability [5]. In this paper we demonstrate that the model toner formulations containing silica composite additives have better fusability than the formulations containing colloidal silica.