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Chemguard HS-100 is a 45% actives proprietary anionic hydrocarbon surfactant useful in the preparation of highly fluorine efficient AFFF agents. It does not interfere with fluorosurfactant action, allowing the fluorosurfactant to obtain optimal performance. Chemguard HS-100 provides enhanced foam expansion and drain time when used at 0.5 – 1.5% in 3% AFFF agents. When used at the above concentration range, Chemguard HS-100 improves foam fluidity, thereby increasing fire extinguishing rate.