Fire-fighting foaming composition

EP4739404A1Pending Publication Date: 2026-05-13BIOEX SAS
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
BIOEX SAS
Filing Date
2024-06-28
Publication Date
2026-05-13

AI Technical Summary

Technical Problem

The use of fluorinated surfactant compounds in fire-fighting foams is prohibited due to environmental concerns, and the addition of high molecular weight polysaccharides to stabilize foams increases viscosity, making it difficult to achieve stable foams without complicating the proportioning and automated dosing of fire-fighting compositions, especially at lower temperatures.

Method used

A fire-fighting foaming composition comprising a main polysaccharide with an average molecular weight between 300,000 and 6,000,000 Dalton, a secondary polysaccharide or water-soluble protein, and a calcium salt, which together control viscosity and stabilize foams without the need for fluorinated compounds, ensuring the composition remains less than 35 mPa/s when the main polysaccharide is absent, thereby facilitating easier mixing and application.

Benefits of technology

The composition achieves controlled viscosity and stable foam formation, maintaining effectiveness in extinguishing fires while avoiding the environmental drawbacks of fluorinated surfactants and simplifying the dosing process, as demonstrated by synergistic effects between the secondary polysaccharide, protein, and calcium salt, which significantly reduce viscosity and maintain foam quality post-dilution.

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Abstract

The invention relates to a fire-fighting foaming composition which comprises: • - at least one surfactant; • - at least one polysaccharide, referred to as the main polysaccharide, having an average molecular weight greater than 300,000 daltons and advantageously less than 6,000,000 daltons; • - an additional compound which comprises at least one of the following compounds: • a) a polysaccharide, referred to as the secondary polysaccharide; • b) a water-soluble protein; the additional compound having a viscosity of less than or equal to 35 mPa / s, advantageously less than or equal to 30 mPa / s, even more advantageously less than or equal to 20 mPa / s, at 375 s-1 when it is dissolved in the foaming composition devoid of said main compound, at 20°C; • - a calcium salt soluble in aqueous solution, in a non-zero weight percentage of less than 2%.
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