Gas-Hardened Processes (Cold-Box)

A molding sand hardening in these processes occurs as a result of the influence of a catalyst or hardener, in a gaseous form, on components of binding materials at a room temperature. This group contains the following technologies: phenolic–furan resin/SO2 (Hardox), phenolic–urethane cold-box resin (PUCB), resole resin/CO2 system, acryl/epoxy resin/SO2, and FRC process (free radical curing). Since in this technological group apart from inert gases also harmful and toxic gases are applied, these processes require special care. Therefore the development of the new process, applying gases harmless for human organisms and the environment, is necessary.