Sustainable fire suppression with water-based hydrogel works by replacing conventional chemical agents with a modified natural clay and water solution that cools, isolates, and stabilises fires without releasing harmful substances into the environment. Unlike foam agents containing PFAS or other hazardous chemicals, hydrogel is derived from naturally occurring components and carries a carbon footprint of less than 0.7%. The sections below answer the most common questions about how this technology works, what fires it can handle, and why it matters for fire safety professionals and distributors navigating today’s regulatory landscape.
What makes water-based hydrogel different from traditional extinguishing agents?
Water-based hydrogel is different from traditional extinguishing agents because it combines the cooling power of water with a temperature-sensitive gel structure that thickens on contact with heat, keeping the extinguishing medium precisely focused on the fire source. Traditional water or foam agents run off hot surfaces quickly, whereas hydrogel adheres longer, meaning less agent is needed to achieve the same or a better result.
Conventional foam agents, particularly aqueous film-forming foams, have historically relied on PFAS chemistry to achieve surface adhesion and fire suppression. Hydrogel achieves comparable adhesion through a fundamentally different mechanism: modified natural clay particles that respond to rising temperatures by increasing viscosity. This thermoresponsive behaviour means the agent does not simply drain away from a burning surface but forms a persistent cooling layer exactly where it is needed.
The practical difference for operators is significant. Because hydrogel remains attached to hot surfaces longer than water alone, less extinguishing agent is consumed per incident, which reduces both the cost of intervention and the volume of contaminated runoff that must be managed afterward. For industrial sites, warehouses, and maritime operators, that reduction in secondary contamination is a meaningful operational advantage.
You can explore the technical detail behind this mechanism on the how hydrogel works page.
How does hydrogel extinguish lithium-ion battery fires?
Hydrogel extinguishes lithium-ion battery fires through a multi-stage process that addresses the full fire lifecycle: rapid cooling, thermal isolation, gas suppression, and chemical stabilisation of reactive lithium components. This makes it a system-level solution rather than a single-function extinguishing agent, which is critical because lithium-ion battery fires can reignite after visible flames have been suppressed.
Cooling and thermal containment
The high water content of hydrogel absorbs heat rapidly and lowers battery temperature. As temperature rises, the gel thickens and adheres to battery surfaces, forming a persistent insulating layer that limits heat transfer to adjacent cells. This interrupts the process of thermal propagation, where heat from one failing cell triggers failure in neighbouring cells, which is one of the most dangerous characteristics of lithium-ion battery incidents. The gel can also expand during application, improving contact with irregular battery surfaces and increasing heat dissipation.
Gas suppression and lithium stabilisation
Lithium-ion battery fires release hazardous gases including hydrogen, methane, and hydrogen fluoride. Hydrogel reduces concentrations of flammable gases, restricts oxygen availability, and interacts with hydrogen fluoride to convert it into less harmful ionic components. Modified clay particles within the gel penetrate damaged battery structures and bind reactive lithium ions, reducing chemical reactivity and contributing to longer-term stabilisation after visible flames have been extinguished.
After a battery fire has been suppressed, continued monitoring remains essential. A minimum observation period of 20 minutes is recommended to detect signs of renewed instability, followed by at least 48 hours of cooling before disposal. Affected battery packs should be transferred to a water-filled containment vessel or stored in a well-ventilated area, isolated from combustible materials. Residual hydrogel can be removed by absorbing excess material and rinsing with water, and the used agent can be collected and recycled, with its clay-based components potentially suitable for reuse as compost enhancers.
For a detailed breakdown of how the thermal runaway blocker mechanism works in practice, Anogas provides application-specific guidance covering battery systems from small consumer devices through to large industrial installations.
Is hydrogel fire suppression safe for the environment?
Yes, hydrogel fire suppression is safe for the environment. Hydrogel is classified as non-dangerous for humans and the environment under the most stringent European chemical legislation, contains zero PFAS, and is composed of more than 99% naturally derived components. Aquatic toxicity studies conducted according to OECD testing guidelines confirmed that hydrogel is non-toxic to algae and daphnia.
The environmental safety case rests on both what hydrogel contains and what it does not contain. It is formulated from modified natural clay and water, with a carbon footprint of less than 0.7%. There are no synthetic fluorinated compounds, no persistent organic pollutants, and no substances that accumulate in soil or water systems after deployment.
End-of-life management is equally straightforward. Hydrogel has a service life of more than ten years, so premature replacement for technical reasons is not required. When replacement does become necessary, the agent can be discharged without environmental risk. After its service life, hydrogel is expected to be recyclable into a compost-enrichment supplement, an outcome that reflects its natural clay and water composition. This full lifecycle profile makes it genuinely circular in a way that conventional foam agents cannot replicate.
Can hydrogel be used in existing water-based fire suppression systems?
Yes, hydrogel is fully interchangeable with water and can be used in all water-based fire suppression systems without requiring modifications to existing infrastructure. This compatibility means that facilities already operating sprinkler systems, deluge systems, or other water-based suppression equipment can integrate hydrogel without significant capital expenditure.
The interchangeability with water is one of the most commercially relevant features of the technology for distributors and end users. There is no need to replace pipework, nozzles, or control systems to benefit from the improved adhesion, cooling persistence, and gas-suppression properties that hydrogel provides over water alone.
Hydrogel can also be safely used on electrical equipment up to 1,000 V when applied with suitable nozzle configurations, which extends its applicability to environments where electrical hazards are present alongside other fire risks. For handheld applications, portable hydrogel fire extinguishers are available for settings where fixed suppression systems are not installed or where a first-response capability is required.
What fire types can water-based hydrogel suppress?
Water-based hydrogel is suitable for suppressing Class A fires (solid materials such as wood, paper, and textiles), Class B fires (flammable liquids), and Class F fires (cooking oils and fats), as well as lithium-ion battery fires. This broad fire-class coverage makes it a versatile all-in-one suppression medium for environments that face multiple fire risk categories simultaneously.
The gel’s behaviour adapts to the fire type. On solid surfaces, it adheres to vertical walls and ceilings, maintaining a cooling layer across irregular geometries. On non-polar fuels and fats, it floats and forms a separating barrier between the fuel and ignition sources. For lithium-ion battery incidents, the full multi-stage mechanism described above applies, combining cooling, gas suppression, and chemical stabilisation in a way that no single-class agent can replicate.
This versatility is particularly relevant for industries where fire risk profiles are mixed. Warehousing and logistics operations, for example, may store conventional goods alongside lithium-ion battery-powered equipment. Maritime vessels carry both hydrocarbon fuels and increasingly large battery systems. Recycling facilities handle electronic waste, industrial waste streams, and combustible materials in close proximity. A suppression medium that addresses all of these risks within a single, environmentally safe formulation simplifies procurement, training, and compliance, and positions distributors to serve a wide range of end-user markets with one product. For fixed installation contexts, hydrogel-based suppression systems are available for industrial and building fire protection applications.
How does PFAS legislation affect fire suppression product choices?
PFAS legislation is directly forcing fire suppression product choices to change. Regulatory restrictions on per- and polyfluoroalkyl substances are being introduced across the European Union and in markets worldwide, targeting the foam agents that have been standard in fire suppression for decades. Products containing PFAS face phase-out timelines, use restrictions, and, in some jurisdictions, outright bans, creating an urgent need for compliant alternatives.
For fire safety distributors and operators, the legislative pressure creates both a compliance obligation and a procurement decision. Continuing to stock or specify PFAS-containing agents in markets where restrictions are tightening introduces regulatory risk, potential liability for environmental contamination, and reputational exposure. The shift is not theoretical, regulatory frameworks across Europe are actively narrowing the conditions under which PFAS-based agents can be used, stored, and disposed of.
PFAS-free fire suppression agents that match or exceed the performance of their PFAS-containing predecessors are therefore in growing demand. Hydrogel contains zero PFAS, the most accurate measurement systems confirm less than 1 part per billion of PFAS in the formulation, and delivers effective suppression across the fire classes where PFAS-based foams have traditionally been specified. For distributors building a future-proof product portfolio, this combination of regulatory compliance and genuine performance is commercially compelling.
The Hydrogel product page provides full technical and regulatory detail for procurement and compliance evaluation.
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