ApexSil Root Canal Sealer Powder/Liquid, DSI ApexSil is truly radio-opaque, 2-constituent root canal filler, conveyed in powder and liquid. The constituents are these: diepoxide, zirconium dioxide, amine reinforcing agents and softener. Operational time of the Apexsil powder-liquid set (at room temperature) – 1-2 hours. Hardening time (inside the canal) – 24-48 hours.