Description

WILLIAMS CLASS B AR-AFFF 3%x3% Concentrate Foam Tote – 704601

THUNDERSTORM® W833A 3×3 AR-AFFF (Alcohol Resistant Aqueous Film-Forming Foam) Concentrate from Williams Fire & Hazard Control delivers exceptional firefighting performance, continuing the renowned heritage of THUNDERSTORM® products.

THUNDERSTORM® W833A Concentrate combines fluoro- and hydrocarbon-surfactant technologies to provide superior fire and vapor suppression for Class B, polar solvent and hydro-carbon fuel fires. This synthetic foam concentrate is intended for forceful or gentle firefighting applications at 3% solution on hydrocarbon fuels and gentle firefighting applications at 3% solution on polar solvent fuels in fresh, salt, or hard water.

THUNDERSTORM® W833A foam solution utilizes three suppression mechanisms intended for rapid fire knockdown and superior burnback resistance:

• The foam blanket blocks oxygen supply to the fuel.
• Liquid drains from the foam blanket and forms either: An aqueous film on a hydrocarbon fire, or A polymeric membrane on a polar solvent fire which suppresses the vapor and seals the fuel surface.
• The water content of the foam solution produces a cooling effect for additional fire suppression.

TYPICAL PHYSIOCHEMICAL PROPERTIES AT 77 °F (25 °C)

• Appearance Viscous green liquid
• Density 1.03 ± 0.02 g/ml
• pH 7.0 – 8.5
• Refractive Index 1.3490 minimum
• Viscosity* 2800 ± 500 cPs at 30 rpm
• Viscosity* 1550 ± 300 cPs at 60 rpm
• Spreading Coefficient 3 dynes/cm minimum at 3% dilution
• Pour Point 28 °F (-2 °C)
• Freeze Point 27 °F (-3 °C)
• Brookfield Viscometer Spindle #4

THUNDERSTORM® W833A Concentrate is a non-Newtonian fluid that is both pseudoplastic and thixotropic; therefore, dynamic viscosity will decrease as shear increases. The THUNDERSTORM® W833A 3×3 AR-AFFF Concentrate formulation contains short-chain, C6 fluorochemicals manufactured using a telomer-based process that does not produce PFOS.010213

Approvals, Listings, and Standards

THUNDERSTORM® W833A 3×3 AR-AFFF Concentrate is designed in accordance with National Fire Protection Association (NFPA) Standard 11 for Low-, Medium-, and HighExpansion Foam.

The THUNDERSTORM® W833A formulation has been successfully evaluated in accordance with the Williams Fire & Hazard Control Plunging Test protocol.

Application

THUNDERSTORM® W833A 3×3 AR-AFFF Concentrate is intended for use on both types of Class B fires: hydrocarbon fuels with low water solubility, such as crude oils, gasolines, diesel fuels, and aviation fuels; and polar solvent fuels with appreciable water solubility, such as methyl and ethyl alcohol, acetone, and methyl ethyl ketone. To provide even greater fire protection capability, THUNDERSTORM® W833A foam solution may be applied simultaneously with WILLIAMS FIRE & HAZARD CONTROL PKW dry chemical for a twin-agent system. When using twin-agent application on polar solvent fuels, care must be taken with the velocity of the dry chemical discharge to minimize submergence of the polymeric membrane below the fuel surface.

THUNDERSTORM® W833A Concentrate can be ideal for fixed, semi-fixed, and emergency response firefighting applications such as:

• Flammable liquid in depth and spill fires
• Fuel or chemical storage tanks
• Industrial chemical and petroleum processing facilities
• Truck/rail loading and unloading facilities
• Mobile equipment

Foaming Properties

THUNDERSTORM® W833A 3×3 AR-AFFF Concentrate may be effectively applied using most conventional foam discharge equipment at the correct dilution with fresh, salt, or hard water. For optimum performance, water hardness should not exceed 500 ppm expressed as calcium and magnesium. THUNDERSTORM® W833A Concentrate requires low energy to foam and the foam solution may be applied with aspirating and non-aspirating discharge devices. Non-aspirating devices, such as handline water fog/stream nozzles or standard sprinkler heads, typically produce expansion ratios from 2:1 to 4:1. Aspirating low-expansion discharge devices typically produce expansion ratios from 3.5:1 to 10:1, depending on the type of device and the flow rate. Medium-expansion discharge devices
typically produce expansion ratios from 20:1 to 60:1.

Typical Foaming Characteristics* (Fresh and Sea Water)

• Proportioning Rate 3%
• Expansion Ratio ≥ 7
• 25% Drain Time (min:sec) ≥ 10
• 50% Drain Time (min:sec) ≥ 15

*per EN 1568-3: 2008 protocol using UNI86 aspirating nozzle

Proportioning
The recommended operational temperature range for THUNDERSTORM® W833A 3×3 AR-AFFF Concentrate is 35 °F to 120 °F (2 °C to 49 °C). This foam concentrate can be correctly proportioned using most conventional, properly calibrated, in-line proportioning equipment such as:

• Balanced and in-line balanced pressure pump proportioners
• Balanced pressure bladder tanks and ratio flow controllers
• Around-the-pump type proportioners
• Fixed or portable in-line venturi type proportioners
• Handline nozzles with fixed eductor/pick-up tubes