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
Hamlet chicken processing plant fire . When the line with a customized connector was brought up to normal operating pressure, it separated from the connector at between . Hydraulic fluid spattered onto the heating lines for the cooker and immediately vaporized. This vapor then went directly into the flame of the gas-fired cooker. The vapor had a relatively low flash point and erupted into a fireball. The ruptured hydraulic line then pumped of hydraulic fluid into the fire before electrical failure shut it down. A state-of-the-art automatic carbon dioxide fire extinguisher designed to cope with such fires had been installed over the vat after a