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        • First Response
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        • Phos-Chek 1% Fluorine Free
        • Phos-Chek 3×6 Fluorine Free
        • Phos-Chek Multi-Expansion H930
        • Phos-Chek Training Foam 136
        • Phos-Chek Training Foam EE-3
      • For Municipalities
        • Phos-Chek 1% AFFF
        • Phos-Chek 1% AFFF Freeze Protected
        • Phos-Chek 3% AFFF
        • Phos-Chek 3% AFFF M
        • Phos-Chek 3% AFFF Freeze Protected
        • Phos-Chek 3% AFFF MilSpec
        • Phos-Chek 6% AFFF
        • Phos-Chek 3% AFFF MilSpec
        • Phos-Chek 1×1 AR-AFFF Low Viscosity
        • Phos-Chek 1×3 AR-AFFF Ultra
        • Phos-Chek 3×3 AR-AFFF
        • Phos-Chek 3×3 AR-AFFF Freeze Protected
        • Phos-Chek 3×3 AR-AFFF Low Viscosity
        • Phos-Chek 3×6 AR-AFFF
        • Phos-Chek 1% Fluorine Free
        • Phos-Chek 3×6 Fluorine Free
        • Phos-Chek Multi-Expansion H930
        • Phos-Chek Training Foam 136
        • Phos-Chek Training Foam EE3
    • Gel
      • For Industrial/Military
        • Phos-Chek Insul-8
      • For Municipalities
        • Phos-Chek Insul-8
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        • Phos-Chek Insul-8
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  • About
  • Products
    • Fire Retardant
      • For Homeowners
        • Phos-Chek Home Defense Ready to Use
        • Phos-Chek Home Defense
      • For Wildland
        • Phos-Chek MVP-Fx
        • Phos-Chek MVP-F
        • Phos-Chek 259-F
        • Phos-Chek LC95A-Fx
        • Phos-Chek LC95A-F
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        • FT936
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    • Class A Foam
      • For Municipalities
        • Phos-Chek WD881
        • Phos-Chek WD881C
        • First Response
        • Phos-Chek SOLID
      • For Wildland
        • Phos-Chek WD881
        • Phos-Chek WD881C
        • First Response
        • Firefoam 103b
        • Phos-Chek SOLID
    • Class B Foam
      • For Industrial/Military
        • Phos-Chek 3% AFFF MilSpec
        • Phos-Chek 1% AFFF
        • Phos-Chek 1% AFFF Freeze Protected
        • Phos-Chek 3% AFFF
        • Phos-Chek 3% AFFF M
        • Phos-Chek 3% AFFF Freeze Protected
        • Phos-Chek 6% AFFF
        • Phos-Chek 6% AFFF MilSpec
        • Phos-Chek 1×1 AR-AFFF Low Viscosity
        • Phos-Chek 1×3 AR-AFFF Ultra
        • Phos-Chek 3×3 AR-AFFF
        • Phos-Chek 3×3 AR-AFFF Freeze Protected
        • Phos-Chek 3×3 AR-AFFF Low Viscosity
        • Phos-Chek 3×6 AR-AFFF
        • Phos-Chek 1% Fluorine Free
        • Phos-Chek 3×6 Fluorine Free
        • Phos-Chek Multi-Expansion H930
        • Phos-Chek Training Foam 136
        • Phos-Chek Training Foam EE-3
      • For Municipalities
        • Phos-Chek 1% AFFF
        • Phos-Chek 1% AFFF Freeze Protected
        • Phos-Chek 3% AFFF
        • Phos-Chek 3% AFFF M
        • Phos-Chek 3% AFFF Freeze Protected
        • Phos-Chek 3% AFFF MilSpec
        • Phos-Chek 6% AFFF
        • Phos-Chek 3% AFFF MilSpec
        • Phos-Chek 1×1 AR-AFFF Low Viscosity
        • Phos-Chek 1×3 AR-AFFF Ultra
        • Phos-Chek 3×3 AR-AFFF
        • Phos-Chek 3×3 AR-AFFF Freeze Protected
        • Phos-Chek 3×3 AR-AFFF Low Viscosity
        • Phos-Chek 3×6 AR-AFFF
        • Phos-Chek 1% Fluorine Free
        • Phos-Chek 3×6 Fluorine Free
        • Phos-Chek Multi-Expansion H930
        • Phos-Chek Training Foam 136
        • Phos-Chek Training Foam EE3
    • Gel
      • For Industrial/Military
        • Phos-Chek Insul-8
      • For Municipalities
        • Phos-Chek Insul-8
      • For Wildland
        • Phos-Chek Insul-8
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    • Online Training
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    • All Safety Data Sheets
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Wildland Homeowners Municipal Industrial/Military
  • Municipal
  • Class A Foam
  • Phos-Chek WD881

Phos-Chek WD881

Phos-Chek WD881 Class A Foam concentrate is specially formulated to make water more effective for firefighting. The unique combination of surfactants in WD881 significantly reduces water’s surface tension and, when mixed with air, creates a superior foam blanket that surrounds fuels with a thick layer of water. This creates a barrier between the fuel and the fire, knocking down the fire faster than water alone, and allowing fire fighters to see the areas of application. Making the water more effective reduces the amount of water needed to extinguish the fire, reduces water damage and increases fire fighter safety through quicker knockdown and reduced mop-up/overhaul requirements.

WD881 is highly effective for fighting Class A fires when mixed with water at use rates of 0.1% to 1.0%. It has proven effectiveness in many applications including Compressed Air Foam Systems (CAFS), structural firefighting, forest fire suppression and prescribed burning, mine fires, industrial Class A fires, and for extinguishing hydrocarbon spill fires.

Phos-Chek WD881 is the most concentrated Class A foam product available today. Other products contain significantly more water in the concentrate. This extra water means higher use rates will be required to achieve expected results.

WD881 does not contain fluorinated surfactants such as PFOS/PFOA. Fluorinated surfactants are used in Class B foam concentrates and are necessary to form a film on flammable liquid fires.

Class B foams should not be used on Class A fires. Never mix Class A and Class B foam concentrates.

Available Options:

Package Size

260 Gal Tote, 5 Gal Pail, 55 Gal Drum, Bulk

Product Form

Liquid Concentrate

Quick Links

  • WD881 Brochure
  • Foam Mixing and Application Guide
  • Getting a Quality Foam
  • Environmental Q&A
  • USDA Forest Service QPL
  • USDA Forest Service Testing Data
  • Sample Foam Specification
  • MSDS
  • Product Profile
  • UL Wetting Agent Listing

Municipal Products

Which product do you need? Find what you're looking for here.

  • Class A Foam

    Class A Foam improves water effectiveness. Provides fast knock down. Slows evaporation and improves penetration in deep seated fires. Perfect for CAFS.

    Explore
  • Class B Foam

    Quickly extinguishes and prevents reignition for flammable liquid pool fires. Ideal for storage tanks, railcars, automobile gas tanks, or any fire involving flammable liquid storage.

    Explore
  • Fire Extinguisher Additives

    Liquid fire extinguishers are highly effective and cause far less peripheral damage than powder extinguishers. Class a or Class B additives significantly improve their effectiveness.

    Explore
  • Gel for Municipalities

    Fire suppressant gel is thickened water typically used to coat a structure to protect it from impinging fire. Gel wraps a “blanket of water” around any structure, keeping it cool and preventing ignition from nearby fires.

    Explore

Related Products

  • Phos-Chek LC95A-MV

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    FT934

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  • MRB-Helicopter

    Read more
  • PC-CODE

    Read more

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