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This technical overview of the Passive Thermal Control System (PTCS) for the Space Station Freedom (SSF) identifies the need for a Passive Thermal Control System, presents PTCS design concepts, highlights significant design requirements, addresses important design factors and how design goals are accomplished and summarizes development testing results as well as future development test plans. A Passive Thermal Control System is an essential component in ensuring the survivability of Space Station Freedom in the hostile space environment for a design life of 30 years. Design requirements specify a thermal environmental range of -250° F (-156.7°C) to +300° F (148.9°C), which accounts for the range of surface temperatures that can be encountered during orbit, and a maximum acceptable thermal leak from the pressurized modules.