3% x 3% AR-AFFF, Low Temperature

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CHEMGUARD® C337-LT13 3x3 Low Temperature AR-AFFF (Alcohol-Resistant Aqueous Film-Forming Foam) Concentrate combines fluoro- and hydrocarbon-surfactant technologies to provide superior fire and vapor suppression for Class B, polar solvent, and hydrocarbon fuel fires. This synthetic foam concentrate is intended for forceful or gentle firefighting applications at 3% solution on hydrocarbon fuels and for gentle firefighting applications at 3% solution on polar solvent fuels in fresh, salt, or hard water. The dual 3% solution level for CHEMGUARD® C337-LT13 Concentrate minimizes the product required to protect against hydrocarbon and polar solvent fuel fire hazards.

CHEMGUARD® C337-LT13 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 amber liquid
Density 1.05 ± 0.02 g/ml
pH 7.0 - 8.5
Refractive Index 1.3680 minimum
Viscosity* 2,300 ± 300 cPs
Sediment** ≤ 0.25%
Spreading Coefficient 3 dynes/cm minimum at 3% dilution
Pour Point ≤ 5 °F (-15 °C)
Freeze Point ≤ 0 °F (-18 °C)
Storage and Operating Range** 9 °F to 140 °F (-13 °C to 60°C)
*Brookfield viscometer, Spindle #4, Speed 60 rpm
**EN 1568:2008 protocol

CHEMGUARD® C337-LT13 Concentrate is a non-Newtonian fluid that is both pseudoplastic and thixotropic; therefore, dynamic viscosity will decrease as shear increases.

The CHEMGUARD® C337-LT13 3x3 AR-AFFF Concentrate formulation contains short-chain, C6 fluorochemicals manufactured using a telomer-based process that does not produce PFOS.

Approvals, Listings, and Standards

CHEMGUARD® C337-LT13 3x3 AR-AFFF Concentrate is approved, listed, qualified under, or meets the requirements of the following specifications and standards:

  • EN 1568: 2008
    • Parts 1, 2, 3, 4
  • ICAO
    • Level B
  • IMO MSC. 1/Circ. 1312
  • MED Modules B and D


CHEMGUARD® C337-LT13 3x3 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. It may also be used in conjunction with dry chemical agents to provide even greater fire suppression performance.

CHEMGUARD® C337-LT13 Concentrate can be ideal for fixed, semi-fixed, and emergency response firefighting applications such as:

  • Docks, on-board marine, and helipad systems
  • Fuel or chemical storage tanks
  • Industrial chemical and petroleum processing facilities
  • Truck/rail loading and unloading facilities
  • Flammable liquid containment areas

Foaming Properties

CHEMGUARD® C337-LT13 3x3 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.

CHEMGUARD® C337-LT13 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 Foam Characteristics** (Fresh and Salt Water)
Proportioning Rate 3%
Expansion Ratio ≥ 8.0
25% Drain Time (min:sec) ≥ 8:00
50% Drain Time (min:sec) ≥ 12:00
**per EN 1568-3, 2008 protocol


The recommended operational temperature range for CHEMGUARD® C337-LT13 3x3 AR-AFFF Concentrate is 9 °F to 140 °F (-13 °C to 60 °C) per EN 1568. However, the diluted solution will freeze at 32 °F (0 °C). This foam concentrate can require special proportioning equipment. It 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

For immediate use: The concentrate may be diluted with fresh or sea water to a 3% pre-mix solution.

For delayed use: Consult Technical Services for guidance regarding suitability of a stored pre-mix solution (fresh water only).

Materials of Construction Compatibility

To help avoid corrosion, galvanized pipe and fittings should never be used in contact with undiluted CHEMGUARD® C337-LT13 3x3 AR-AFFF Concentrate. Refer to Johnson Controls Technical Bulletin Acceptable Materials of Construction for recommendations and guidance regarding compatibility of foam concentrate with common materials of construction in the firefighting foam industry.

Storage and Handling

CHEMGUARD® C337-LT13 3x3 AR-AFFF Concentrate should be stored in the original supplied package (HDPE totes, drums, or pails) or in the recommended foam system equipment as outlined in Johnson Controls Technical Bulletin Storage of Foam Concentrates. A thin layer up to 1/4 in. (6 mm) thick of appropriate-grade mineral oil may be applied to the surface of the foam concentrate stored in a fixed, atmospheric storage container to help minimize evaporation.

Consult Johnson Controls for further guidance regarding the use of mineral oil to help seal the surface of AR-AFFF concentrates.

The concentrate should be maintained within the recommended operational temperature range. Freezing of the product should be avoided. If, however, the product freezes during transport or storage, it must be thawed and inspected for signs of separation. If separation has occurred, or is suspected, the CHEMGUARD® C337-LT13 Concentrate should be mechanically mixed until homogeneous, and additional testing may be required after mixing to verify product quality.

Factors affecting foam concentrate’s long-term effectiveness include temperature exposure and cycling, storage container characteristics, air exposure, evaporation, dilution, and contamination. The effective life of CHEMGUARD® C337- LT13 Concentrate can be maximized through optimal storage conditions and proper handling. CHEMGUARD® concentrates have demonstrated effective firefighting performance with contents stored in the original package under proper conditions for more than 10 years.

Mixing CHEMGUARD® C337-LT13 Concentrate with other foam concentrates for long-term storage is not recommended. Use in conjunction with comparable 3x3 AR-AFFF products for immediate incident response is appropriate.


CHEMGUARD® C337-LT13 3x3 AR-AFFF Concentrate should be inspected periodically in accordance with NFPA 11, EN 13565-2, or other relevant standard. A representative concentrate sample should be sent to Johnson Controls Foam Analytical Services or other qualified laboratory for quality analysis per the applicable standard. An annual inspection and sample analysis is typically sufficient unless the product has been exposed to unusual conditions.

Ordering Information

CHEMGUARD® C337-LT13 3x3 AR-AFFF Concentrate is available in pails, drums, totes, or bulk shipment.

Part No. Description Shipping Weight
704768E 5 gal (19 L) 45 lb (20.4 kg)
704769E 55 gal (208 L) 495 lb (224.5 kg)
704770E 265 gal (1,003 L) 2,463 lb (1,117 kg)
For bulk orders, consult an account representative.

This product is manufactured in Italy.

Safety Data Sheets (SDS) are available at www.chemguard.com.

If any foam product is discharged into the environment, efforts should be made to control, contain and collect the discharge for proper disposal, while following all applicable laws, regulations, and codes. Further information regarding the use, discharge, and disposal of firefighting foams can be found at www.chemguard.com.

Note: The converted values in this document are provided for dimensional reference only and do not reflect an actual measurement.

CHEMGUARD and the product names listed in this material are marks and/or registered marks. Unauthorized use is strictly prohibited.