- Program Areas
- Installation Energy and Water
- Environmental Restoration
- Munitions Response
- Resource Conservation and Resiliency
- Weapons Systems and Platforms
Fluorine Free Aqueous Film Forming Foams Based on Functional Siloxanes
Kris Rangan | Materials Modification Inc
Aqueous film forming foams (AFFFs) containing perfluoro octanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) have been traditionally used by the Department of Defense (DoD) in fuel fire suppression operations. These chemicals have strongest chemical bonds and are considered as persistent, bio-accumulative and toxic (PBT) substances. PFOS/PFOS chemicals have been detected around the world in the food chain, drinking water, animals and human blood. Therefore, the Environmental Protection Agency (EPA) is regulating the chemical industry for the complete elimination of PFOA and PFOS chemicals along with certain C6 substances (containing six fluorinated carbons) by 2015. Therefore, the DoD is seeking non-toxic alternatives preferably fluorine-free compounds to replace PFOA/PFOS in firefighting foam formulations.
In this project, specifically functionalized siloxane-based surfactants will be synthesized, and their physical and fire suppression abilities will be evaluated. The tests will include the evaluation of 28-ft² fire performance, spreading coefficient, aquatic toxicity, chemical oxygen demand (COD) and bio-persistency.
New fluorine-free formulations for AFFF developed in this project will meet the performance specifications of the fire extinguishing agent, based on MIL-PRF-24385F standard. The new chemicals will comply with environmental regulations and will be safe to by military personnel and eliminate the logistical burden of cleaning contaminated sites.