Quadra Trading AG: Supplier of raw materials for the cement industry (clinker, mineral additives, iron ore, ....) and the concrete sector (cement, fly ash, silica fume) as well as for the refractory industry (metakaolins, chamottes, corundum, andalusites, mullites and calcined bauxite), we provide customized consulting solutions for the implementation and design of your projects. Since 2009 we have assisted various cement groups to implement efficient Quality Controls and have facilitated the certification of many cement plants according to CE, NF, BENOR, and KOMO standards.