Fire extinguisher in the early 60s and Purple-K being developed by the US Navy in the late 1960s. Manually applied dry agents such as graphite for class D (metal) fires had existed since WWII, but it wasn't until 1949 that Ansul introduced a pressurized extinguisher using an external CO2 cartridge to discharge the agent. Met-L-X (sodium chloride) was the first extinguisher developed in the US, with graphite, copper, and several other types being developed later. In the 1970s, Halon 1211 came over to the United States from Europe where it had been used since the late 40s or early 50s. Halon 1301
Honolulu Fire Department fire prevention and other public safety education programs. CRO manages the museum and offers fire safety classes. Class topics range from general fire safety prevention and preparedness tips, use of a fire extinguisher, understanding the common causes of fire, how to prevent fires, and what to do in case of a fire. CRO also participates in numerous fire safety education community events. A publication the HFD produces annually is the Fire Fighter’s Safety Guide (FFSG). The FFSG is now going on about 30 years since its first publication and about 100,000 copies are now distributed island wide to all schools.