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CHEMGUARD S-103A is a highly efficient, proprietary short-chain perfluoro-based anionic fluorosurfactant at 45% actives. This fluorosurfactant being an alkyl sodium sulfonate is soluble and foams readily in both tap and sea water. It has been used in combination with other fluorosurfactants (i.e. CHEMGUARD FS-818-6, and CHEMGUARD FS-221) to formulate premium AFFF agents meeting the US Military specification (Mil-F-24385F). S-103A is effective in both alkaline and acidic formulations.