UltraCal XS 35% Calcium Hydroxide Paste EXPORT PACKAGE Refill: 4 - 1.2 mL Syringes. 12.5 pH Aqueous Solution in Prefilled Syringes. Radiopaque. Used for Temporary Filling and Disinfection of Root Canals. It is recommend the larger 29ga NaviTip tip be used for predictable flow, enabling direct placement. UltraCal XS can be thoroughly removed from the canal using Ultradent Citric Acid and a NaviTip FX tip. 4 - 1.2 ml syringes