40 Custom manufacture of prefabricated construction elements and components, in particular those of quartz glass and technical ceramics; treatment of materials, namely, processing of quartz and ceramic surfaces of tools, medical apparatus, instruments, implants, machines, parts for machines and other components for medical technology by means of polishing machines, sandblasting machines for the automotive industry, mechanical engineering, semiconductor technology, the decorative sector and the tool sector; treatment of materials, namely, processing quartz and technical ceramic surfaces of tools, medical apparatus, instruments, implants, machines, parts for machines and other components for medical technology by means of hot processing, physical and/or chemical vapour deposition and ion and plasma-assisted processes for the automotive industry, mechanical engineering, semiconductor technology, the decorative sector and the tool sector; material modification, namely, treatment of glass and ceramic surfaces of tools, medical apparatus, instruments, implants, machines, parts for machines and other components for medical technology, by means of CNC machines for the automotive industry, mechanical engineering, semiconductor technology, the decorative sector and the tool sector; material modification, namely, treatment of tools, medical apparatus, instruments, implants, machines, machine parts and other component surfaces by means of polishing machines, sandblasting machines, in the field of medical technology, automotive industry, mechanical engineering, semiconductor technology, decorating, tools; providing materials with a coating, namely, coating of surfaces by means of physical and/or chemical vapour deposition and ion and plasma-assisted processes; glass polishing in the nature of removal of process-related material deposits or the sealing of scratches and surface defects by fire polishing; custom manufacturing, of electrical and medical components, of glass and ceramics; custom manufacture in clean rooms of electrical components, electronic components, electronic semi-conductors, semiconductor devices, process tubes, process chambers, plates and frames for semiconductors, test tubes, photovoltaic installations, photovoltaic reference cells, medical instruments, medical apparatus, of quartz glass and ceramics; decontamination of hazardous materials