Herein, we have attempted to recycle the waste gypsum to be used as filler material in polymer composite. In this regard, aqueous dispersion of gypsum was ultrasonicated for varying time duration (10, 30, and 60 min), dried and used as fillers to develop corresponding EPDM composites. As per the mechanical performance (i.e., tensile strength and elongation at break), the gypsum obtained after ultrasonication for 60 min (i.e., U-60 gypsum) was found best performing filler material compared to the other ultrasonicated gypsum samples, commercial carbon black, and another surface treated gypsum sample. The decreased particle size and enhanced surface area of U-60 gypsum are supposed to be responsible for improving the mechanical property of the composite. Corresponding particle size, surface area, and morphology of all the gypsum samples were thoroughly examined to conclude the reason behind such observation.

在本文中，我们尝试回收废石膏以用作聚合物复合材料中的填充材料。在这方面，将石膏的水分散体超声处理不同的持续时间（10、30和60分钟），干燥并用作填料以开发相应的EPDM复合材料。根据机械性能（即抗张强度和断裂伸长率），与其他超声石膏样品（商用炭黑）相比，超声60分钟后获得的石膏（即U-60石膏）被认为是性能最好的填充材料。和另一个表面处理过的石膏样品。U-60石膏的减小的粒度和增加的表面积被认为是负责改善复合材料的机械性能的原因。相应的粒径，表面积，