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Wet Chemical (Class K) Extinguishers

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Introduction: Specialized Suppression for Commercial Cooking Fires

Wet Chemical Extinguishers, also known as Class K extinguishers, are specifically designed for combating fires involving commercial cooking oils and fats (Class K), such as those found in deep fat fryers, griddles, and commercial kitchen hoods. They are mandatory in all commercial kitchens using combustible cooking media (NFPA 10).

The agent is an aqueous solution of potassium acetate, potassium carbonate, or potassium citrate. When discharged, it creates a chemical reaction called saponification—the agent converts the burning oil or fat into a non-combustible soap-like foam (or blanket). This blanket both smothers the fire and rapidly cools the hot cooking media below its auto-ignition temperature, preventing flash-back.

The extinguisher is low-pressure, stored-pressure, and features a specialized long application wand/nozzle to ensure the operator can apply the agent gently, preventing splashing of the hot grease. Common sizes are 6 Liter and 2.5 Gallon units. (Approx. 500 words)

Advantage: Saponification Effect, No Splashing, and Superior Cooling

  • Saponification: Chemically converts burning oil into a foam blanket, providing superior and long-lasting suppression compared to ABC powder.
  • Prevents Flash-Back: Rapid cooling of the oil below its auto-ignition point (around 700∘F) prevents immediate re-ignition of the fat/oil.
  • Safe Application: The long wand and mist nozzle ensure the agent is applied gently, preventing hot oil splashing onto the operator or surrounding areas.
  • Mandated by Code (NFPA 10): The only acceptable portable extinguisher for commercial deep fat fryer hazards.
  • Ancillary Ratings: Often carries secondary Class A and Class B ratings, allowing some use on surrounding non-K hazards.
  • Ease of Cleanup: The resulting soap-like film is easier to clean from surfaces than powder residue, though professional cleaning is still required.

Specification: Agent, Suppression Method, and Nozzle

Agent TypePotassium Acetate/Carbonate Solution (Wet Chemical)
Fire Class CoverageClass K (Cooking Oils/Fats)
Suppression MethodSaponification (Creates a Soap Blanket) and Cooling
UL Fire Rating1A:2B:C (Ancillary Rating) and K (Primary Rating)
Working Pressure100 psi to 150 psi (Propellant: Air/Nitrogen)
Discharge FeatureLong Applicator Wand with Fine Mist Spray Nozzle
Valve MaterialStainless Steel or Chrome-Plated Brass
Standard ComplianceNFPA 10, UL 711/300 (Kitchen Systems), UL 8

Protection for High-Heat Commercial Kitchens

Commercial Restaurant Kitchens

Mandatory placement near deep fryers and cooking equipment that use vegetable oils or animal fats.

Hospital and University Cafeterias

Protecting high-volume kitchen equipment from Class K fires, often supplementing an overhead hood suppression system (NFPA 96).

Mobile Food Trucks and Catering Units

Smaller, portable units used to meet code requirements for cooking equipment in mobile food service operations.

Industrial Food Processing Plants

Used in areas with large-scale frying or oil processing equipment to handle Class K fire risk.

Marine Galleys

Corrosion-resistant stainless steel units used in ship galleys to protect against cooking oil fires at sea.

Grow Your Bussiness With KAITUO

  • INNOVATION

    Professional R&D Team

    We have a professional R&D team of over 15 people who are able to provide innovative products and customized design services to our customers.

  • QUALITY

    Product quality assurance

    We adhere to quality as a lifeline for our business development, and strict quality management systems ISO and CE, as well as a variety of advanced quality testing equipment are our guarantees for product quality.

  • PRODUCTION CAPACITY

    Annual output exceeds 400,000

    Every month over 400,000 pcs of kinds of valves, including fire extinguisher valve, lpg valve, marine gas cylinder valve and so on.

  • SERVICE

    One-stop service

    We have complete design, and product development, testing and quality control are all carried out in the factory, which to a certain extent guarantees the high quality and performance of Kaituo fire equipment.

Payment & Shipping: Flexible Global Trade Solutions

We offer comprehensive and secure international trade terms tailored to our global clientele.

  • Accepted Payment Methods:

    Wire Transfer (T/T): Standard 30% deposit to confirm the order, 70% balance upon presentation of Bill of Lading (B/L) copy.

    Letter of Credit (L/C): Irrevocable L/C at sight for custom chemical blend orders, providing maximum financial security for both parties.

  • Shipping Terms (Incoterms):

    FOB (Free On Board): Ningbo Port is our standard shipping hub.

    CIF/CFR: Available upon request; we manage shipping logistics to your designated port.

  • Packaging:

    Units are individually wrapped, with the application wand secured, and palletized for stable transport.

Comprehensive Information Summary

Minimum Order Quantity (MOQ)2,000 Units (6 Liter/1.5 Gallon)
Lead Time70-85 Days (Cylinder Fabrication, Wet Chemical Sourcing/Blending, Valve Assembly, and UL/EN Testing)
PackagingIndividual Carton, Wand Protection, Palletized Shipping.
CertificationsNFPA 10, UL 8, UL 711, EN 3, CE Marked, Class K Primary Rating, ISO 9001.
Raw MaterialsStainless Steel Cylinder, Potassium Acetate/Carbonate Solution, Nitrogen Propellant, Stainless Steel Valve, Fine Mist Nozzle.
Customization OptionsVolume (Liter/Gallon), Valve Material (Stainless Steel for Durability), Hose/Wand Length, Label Design/Language.

Professional Usage Tips

  1. Annual Inspection:

    Extinguishers must receive an annual professional inspection (NFPA 10), including gauge check and verification of the long wand and nozzle integrity.

  2. Nozzle Care:

    Ensure the fine mist nozzle is not damaged or clogged during storage, as this will compromise the saponification effect and splashing prevention.

  3. Approach Distance:

    Train users to maintain a safe distance and use the full length of the application wand to apply the agent gently onto the burning oil surface.

  4. Placement/Travel Distance:

    The maximum travel distance to a Class K unit should not exceed 30 feet from the cooking hazard (NFPA 10).

  5. Re-ignition Check:

    After discharge, ensure the unit remains in place until the oil is completely cooled. Wet chemical does not require shaking like ABC units.

Get in Touch

ABOUT KAITUO
Ningbo Kaituo Valve Co., Ltd., also known as Ningbo Anke Fire Equipment Co., Ltd., is China Wet Chemical (Class K) Extinguishers Manufacturers and Wholesale Wet Chemical (Class K) Extinguishers Factory, specializing in the research and development, production and export of fire equipment. It owns the anke brand and a number of national high-tech patents.
Founded in 2001, our company mainly provides high-quality fire protection products for the international market, specializing in the production of various types of fire extinguisher accessories, marine gas cylinder valves, gas valves, etc. After years of hard work and continuous improvement of process reform, our products are exported to dozens of countries around the world and have won a good international reputation. All of our products have obtained the EU EN, CE certification in 2007.
Welcome all customers to call and visit us. Our company has a professional sales team to provide accurate services.
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FAQ

Saponification is the chemical reaction where the wet chemical agent reacts with the burning oil/fat to form a non-combustible, soap-like foam blanket.

No. ABC powder does not cool the oil sufficiently, and the oil can easily re-ignite after the powder dissipates (NFPA 10).

The maximum travel distance from the hazard (e.g., deep fryer) to the Class K unit is 30 feet.

Wet chemical units require hydrostatic testing every 12 years (NFPA 10).

Yes, the fine mist is non-conductive, granting the unit a Class C rating for use on electrical cooking equipment.

The long wand allows the operator to apply the agent gently from a distance, preventing the splashing of hot cooking oil.

The Minimum Order Quantity (MOQ) for high-volume Class K units is typically 2,000 units.

Yes, it typically carries a secondary Class A rating (1A) and can be used on surrounding solid combustibles.

Yes, a portable Class K extinguisher is required as a backup even if an overhead wet chemical system is installed.

UL 300 is the standard for the fire testing of automatic wet chemical suppression systems used in restaurant cooking areas.