Safe storage and transport: Siempelkamp is your container manufacturer for heat-generating and non-heat-generating radioactive materials Wide range of designs for all classes We produce a variety of containers for handling radioactive materials of all classifications. The choice of materials ranges from the use of different casting qualities to granulated concrete and steel. The range of services is completed by the authorization to carry out type tests. For more than 30 prototype types, the required certificates of qualification for the transport and storage of the casks have already been successfully completed in our manufacturing facilities. CASTOR ® casks bodies CASTOR ® casks are used as transport and interim storage containers for fuel elements and high-level radioactive waste.