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
Fire glass considered an eco-friendly burning solution. Additionally, fire glass is often made from recycled glass, making for a "green" fire media option. In addition to being used as a fire pit and fireplace media, fire glass is often used as a crafting item (e.g. in a wedding centerpiece). Fire glass Fire glass is tempered glass manufactured as a medium to retain and direct heat in fireplaces and gas fire pits. Fire glass does not burn, but retains heat and refracts light as a result of burning gas. Fire glass, like artificial logs and stones, is additionally used to obscure the gas