Carborundum Universal Limited | 29,311 followers on LinkedIn. Engineering | Innovation | Materials Science | CUMI is a mines to market company with integrated operations, including mining, power generation, fusion, manufacturing, marketing and distribution. From Electro Minerals, Abrasives, Refractories and Ceramics, CUMI provides world-class services and solutions for applications across industries, including aerospace, automobile, construction, glass, iron, power, steel and much more.