In firefighting, where every second counts and safety is paramount, innovations that enhance the effectiveness of fire suppression are highly important.
First produced in the 1960s in collaboration between 3M and the US Military, Aqueous Film Forming Foam (AFFF) emerged as a significant advancement, designed to combat flammable liquid fires with remarkable efficiency.
3M was the sole supplier of AFFF firefighting foam to the military until the mid-1990s.
The development of AFFF represented a crucial turning point for firefighting strategies across various industries, from aviation and petrochemicals to military and municipal firefighting.
Despite its efficiency, scientific evidence has shown potential health risks associated with the chemical make-up of AFFF firefighting foam.
A crucial ingredient of AFFF is a fluorinated surfactant, which allows the foam to spread.
Environmental concerns arose as early as 1974.
Though the precise dangers of the foam were ambiguous, there were warnings about the foam’s potential harm to the environment and suggestions to use safer alternatives.
Despite concerns, the foam was continuously discharged into harbors, and it wasn’t until 1996 that concerns resurfaced about the foam’s possible health risks.
Composition of Firefighting Foam Products
AFFF is composed of water, foaming agents, and PFAS chemicals.
This formulation allows it to perform a dual role in firefighting scenarios.
Upon application, AFFF swiftly creates a foam blanket that effectively suppresses fires by preventing the release of flammable vapors, interrupting the combustion process.
The foam also acts as a cooling agent, reducing the temperature of the fire and limiting its spread.
Applications of AFFF Firefighting Foam
AFFF finds widespread application across various industries due to its unique ability to stop fires fueled by flammable liquids.
These include fires started by class B materials such as petroleum, oil, and solvents.
In 1967, following a disastrous fire on the USS Forrestal, which led to the death of 134 sailors, the Navy began requiring vessels to carry AFFF (Aqueous Film Forming Foam).
In military settings, AFFF firefighting foam has been used to extinguish flammable liquid fires both in training scenarios and emergency situations.
In aviation, AFFF foam is a large component of airport firefighting, managing aircraft fires and minimizing damage.
In the petrochemical sector, AFFF is employed to mitigate the hazards posed by industrial fires at refineries and storage facilities.
PFAS Chemicals & Their Use in AFFF Firefighting Foam
PFAS are a class of synthetic chemicals that have earned notoriety for their persistence in the environment and potential health implications.
These substances have carbon-fluorine bonds, which provide exceptional resistance to heat, water, and oil.
While this property makes PFAS highly effective in applications such as AFFF, it also makes them resistant to natural degradation processes.
As a result, PFAS can persist in the environment and the human body for extended periods, earning them the moniker “forever chemicals.”
In 2000, 3M, the original co-developer of AFFF, publicly announced it would cease production of PFOS, a key ingredient of the foam.
The military continued using AFFF formulations with other PFAS surfactants, despite growing concerns about their safety.
Environmental Concerns and Regulation of Forever Chemicals
The persistent nature of PFAS has raised environmental and public health concerns.
PFAS chemicals can migrate from firefighting training grounds, airports, and industrial sites into water sources, soil, and wildlife, potentially posing risks to ecosystems and human populations.
Direct exposure to firefighting foam has also been found to pose an increased cancer risk, as well as risk for other serious health problems.
In response, regulatory bodies, like the Environmental Protection Agency, have initiated efforts to monitor and restrict the use of certain PFAS compounds, advocating for safer alternatives while studying the potential health impacts on both humans and the environment.
Several states have also begun enacting legislation to limit and phase-out the use of PFAS chemicals.
Foam and surfactant manufacturers, including DuPont and Dynax, formed the Fire Fighting Foam Coalition in 2001 to defend and promote their products.
The coalition successfully lobbied the EPA to exclude AFFF from regulatory processes in 2003.
