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What is new S type aerosol fire fighting system

April 3, 2020

Here we recommend “What is the new S-type aerosol fire fighting system“, to explain this topic, we have to know and describe its technology history first.


Aerosol fire extinguishing technology was developed in from 1960’s, and the Russian army first used this technology based on its pyrotechnics, it integrated with the oil tank so at that time people also called it “oil tank fire suppression”, this was the Generation I of aerosol fire extinguishing technology.

In 1990 people around the world cared about the problem of ozone depletion which was caused by using halon products, so from this period on many countries attended the Montreal Protocol, which aimed to protect our ozone layer and forbid to use of halon extinguishing agents, at this time many new fire extinguishing agent became popular include aerosol, and at this stage some enterprises in United States, Cyprus, Netherlands, Italy, Malaysia etc because to develop a aerosol extinguishing agent by using “Potassium Nitrate” as main oxidant, within this period aerosol because more and more popular and global market because to recognize aerosol extinguishing technology to apply in fire protection industry, this potassium nitrate based aerosol is Generation II of aerosol fire extinguishing technology.

In about 2000, because Potassium nitrate aerosol had corrosion problems in electrical devices and electronics, some china universities and institutes worked together with a few fire protection enterprises and researched a new aerosol technology strontium nitrate-based aerosol fire extinguishing agent, which used Strontium Nitrate as main oxidant, this is called the Generation III aerosol fire extinguishing technology, and also the newest aerosol technology at present in the world.

After know about something about aerosol technology development, now we will explain “why S-type aerosol Generation III is the newest aerosol technology”, To describe this we have to mention its advantages first.


  • Aerosol fire extinguishing agents suppress fire by cooling, dilution, and chemical inhibition, other fire extinguishing compounds are only cooling, or only dilution, or chemical inhibition, so aerosol fire extinguishing agents are very functional and with very high fire extinguishing ability.
  • Compared with other gas fire suppression systems, they do not need to have pressure to work, so aerosol cylinders are without any pressure, but other suppression systems especially gas systems need to have pressurized cylinders and containers to take and need to install gauges.
  • Aerosol system is ECO-friendly and human friendly, because aerosol forming compound has low Ozone Depletion Potential(ODP) and Global Warming Potential(GWP) values, and ALT is also low, it is a clean agent further, it is non-toxic, non-conductive, non-corrosive and has little residue after discharging.
  • Long Life Span, aging test for S-type aerosol device shows that the aerosol generator was put in a lab box heating to 90℃ and kept for about 40 days, after putting it out it still can work, this means s type aerosol fire extinguishing agent and its device has a life span of more than 10 years.
  • Aerosol extinguishing agent to extinguish fire both physically and chemically.
  • Compared to K-type aerosol agents, S-type does not have a bad effect on precision instruments and equipment.
    Aerosol has particular advantages in the fire protection industry so that is why aerosol fire extinguishing technology has been given much attention by worldwide people.


Accordingly to installation mode, it is divided into fixed type, attached type, or portable type, accordingly to the main oxidant in aerosol-forming agent, is divided into potassium nitrate-based, strontium nitrate-based, and china institute is also try to research magnesium nitrate based; accordingly to agent discharging quality, it is divided into micro and mini size, general size etc; accordingly to product structure, it is divided into piping type and non-piping type, normally its non-piping.


when the s-type aerosol fire fighting system is discharging:

  • Free radicals are essential to the propagation of a fire-(free radicals of O, H, and OH), s type aerosol extinguishing agent suppresses the fire mainly by chemical interference with these “free radicals” within the fire zone, free radicals are uncharged molecule (typically highly reactive and short-lived) having an unpaired valence electron.
  • S-type aerosol agent and its inert gas suspension discharges and fills the hazard space volume, the chemical particle size is 1 to 2 micro and almost reaches everywhere.
  • Strontium radicals together with some potassium radicals from aerosol agents mixed with free generated by combustion (combustion free radicals).
  • Strontium particles and some potassium particles join with combustion free radicals, interrupting the fire’s reaction pathway and creating stable molecules.
  • The interrupted fire reaction pathway does not sustain combustion anymore and the fire is suppressed completely, the fire is put off.


Its structure is very simple, normally its base structure is made up of the following materials:

  • ignition circuit terminals and aviation plug connectors.
  • 304 stainless steel cylinder or heavy-duty aluminum cylinder.
  • Electronic or thermal sensing ignition device.
  • Solid aerosol-generating compound.
  • Spacer ring.
  • Separator grid.
  • Chemical coolant.
  • Coolant grid.
  • Directional 304 steel or steel plate.
  • Blow of cover(aluminum foil).
  • And also for additional materials of installation bracket and screws, and installation magnet with 3M glue.


Because this type of aerosol is perfect performance in fire suppression, it is widely used mostly apply in the following fields:

  • Wind turbine fields, the wind turbine cabin, impeller, control system, and tower are the positions where easy to cause fire, we should install a mini aerosol fire extinguishing system in the cabin and their relative electrical cabinets.
  • Vehicles, the bus, cars, trucks, coach, vessels, aircraft, heavy-duty, and other vehicles will require mini aerosol fire extinguishing equipment to be installed in their engine compartment.
  • Energy storage facilities, including energy storage stations, power charging piles, cabinets, lithium batteries, etc, these facilities are easy to get fire because of a variety of environmental and human factors.
  • Power and power supply facilities, including thermal power plant, hydropower stations, solar power stations, wind power stations, nuclear power plants, power supply companies, etc, and also their relative control systems and cabinets.
  • Communication facilities, including computer data center, server room, server rack, relay station, telecommunication control room, etc, and their control panels and cabinets board.
  • Underground comprehensive galleries, including subway, water pipe, power gallery, sewage pipe, natural gas pipelines, and communication pipelines, nowadays these underground galleries are key government projects, that require fire protection facilities to be installed over there.
  • Building facilities, including substation, library, archives, reference room, underground storage room, strongbox.
  • Mining facilities, including rolling mill equipment room, electronic instrument control room, cable tunnel, cable sandwich, and transformer room.
  • Petrochemical facilities, including the flammable liquid storage area, substation and power distribution room, generator room, cable well, power distribution cabinet, and switchgear.
  • Other facilities like CNC machines, ATMs, Rolling Machines, and some high-priced mobile devices.

As we can see above application facilities are high-value facilities and equipment that need protection from fire extinguishing devices, and an S-type aerosol extinguishing device is very suitable for them because the type of aerosol agent is:

  • not have corrosion to them and not cause damage to them.
  • It causes little residue after release.
  • Small in size, versatile, functional, and easy to install.
  • Long life span to be installed there.
  • Do not have pressure, so it is safe.

S type in the full name is “Strontium nitrate based type” because our aerosol extinguishing oxidant is chemical of strontium nitrate, almost 42% to 50% percentage.

S-type aerosol is still present the newest aerosol technology is called “Generation Third” technology, To know more about aerosol and especially type aerosol please refer to this research and academic articles:

As an expert in the special hazards fire protection field, In 2013, we invented the first fire extinguishing device based on an S-type aerosol fire extinguishing agent – a floor-standing fire suppression device.

Also in the year 2013, after multiple tests and competitive bidding, our S-type aerosol fire-fighting system was successfully selected by China Telecom and Bangladesh Telecommunications Company Limited as the best solution for its fire protection in server rooms.

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