PHOS-CHEK WD881 Class A Foam concentrate is specially formulated to make water more effective for fire fighting. 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 allow 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.

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.

WD881 is fully tested and qualified for use by the USDA Forest Service under Specification 5100-307a for all application methods. WD881 is compatible with fresh water, sea water and long-term retardant. Foam characteristics are not affected by freeze-thaw.

WD881 is a UL listed wetting agent at only 0.1%, contains NO HAZARDOUS INGREDIENTS, is readily biodegradable, and has no flash point, making it safe to use near open flames. WD881 meets the requirements of NFPA 1150.

Use Rates:

• Wetting Agent: 0.1%
• Direct Attack: 0.3% to 0.5%
• Mop Up/Overhaul: 0.1% to 0.3%
• Exposure Protection: 1.0% Brush (Pre-Treatment): 0.7% to 1.0%

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