Abstract: The present invention provides a system for continuous production of sulfur polymer cement. The system may include a series of high shear mixers, such as twin screw mixers or compounding extruders, to which a sulfur-containing starting material is added at one end, followed by at least one stage at which a sulfur modifier is added. Micro-aggregate may be added at one or more stages. At the discharge end of the continuous system, an extrudate is produced, and a pelletizer may be used to form pellets of the polymerized sulfur and micro-aggregate material. The pelletizer may comprise a flowing cooled water system, e.g., underwater pelletizer. The formed pellets may then go through a dryer system and then to a dry storage collection system.