Alcoseal C6 3-6

3x6% Alcohol Resistant Film Forming Fluoroprotein Foams (AR-FFFP)

AlcosealC6 3-6 is a superior quality Alcohol Resistant Film-Forming FluoroProtein (AR-FFFP) fire fighting foam concentrate for extinguishing and securing flammable hydrocarbon and polar solvent liquid fires. 

Its unique formulation is based on advanced protein foam technology. The protein base material provides a tough cohesive foam blanket with high resistance to heat.

Fluorochemical surface active agents combined with the protein base produce a vapoursealing aqueous film on hydrocarbons. On polar solvents an insoluble polymer membrane is formed which protects the foam blanket from the solvent.

  • Highly versatile - eliminates the need to stock a variety of foam types.
  • Stable and long-lasting foam blanket for excellent burnback resistance and post-fire security.
  • Detergent-free for high resistance to fuel pick-up.
  • Foam blanket re-seals when ruptured by personnel or equipment.
  • Film-forming on hydrocarbons for fast flame knockdown and extinguishment.

Performance Approvals  

  • AlcosealC6 3-6 is independently tested and certified to EN1568:2008 parts 3&4.

  • Passed Lastfire with excellent results.

  • Audited and approved to Underwriters Laboratories UL162 (7th Edition).

Environmental Impact         

AlcosealC6 3-6 is based on a natural protein foaming agent and contains no harmful synthetic detergent or glycol ether.


AlcosealC6 3-6 is the ideal fire fighting foam to use in high risk situations where hydrocarbons (such as  crude oil, gasoline, diesel fuel, aviation kerosene) and/or polar solvents (such as alcohols, ketones, esters, and ethers) are stored, processed, or transported. It is used extensively by industrial and municipal fire departments.

AlcosealC6 3-6 provides a vapour suppressing foam blanket on spills of hazardous liquids.


AlcosealC6 3-6 is intended for use at 3% (3 parts concentrate to 97 parts of water) on hydrocarbons and 6% on polar solvents (6 parts concentrate to 94 parts of water). 

AlcosealC6 3-6 is readily proportioned using conventional foam proportioning equipment such as in-line foam venturi proportioners, balanced pressure proportioners and around-the-pump proportioners.

AlcosealC6 3-6 can be used with air aspirating discharge devices such as low expansion branchpipes, monitors and top pourer sets.

Exceptional resistance to fuel contamination makes it ideal for forceful application on to hydrocarbon storage tank fires from ground-based mobile monitors.

AlcosealC6 3-6 also produces top quality medium expansion foam.

Physical properties


Dark brown liquid

Specific gravity @ 20°C

1.09 - 1.13

pH @ 20°C

6.6 - 7.6


Non-Newtonian (pseudoplastic)

Viscosity @ 20°C (68°F) using No.4 spindle at 60 rpm (cP)

850 - 1750

Max. continuous storage temp. (°C)


Max. intermittent storage temp. (°C)


Freeze point


Effect of freeze/thaw

No performance loss

UL lowest use temp. (°C)


Sediment as shipped (% v/v)

≤ 0.25

Sediment after ageing (% v/v) 

≤ 0.5

Expansion ratio (3% induction) *

≥ 7:1 

25% Drainage time (3% induction) *

≥ 4 minutes 30 seconds

Expansion ratio (6% induction) *

≥ 8:1

25% Drainage time (6% induction) *                

≥ 10 minutes 30 seconds

* Foam generated using the U.K. Defence Standard DEF42-40 5 lpm branchpipe at 7 Bar pressure. Foam collected in a 1630 ml N.F.P.A. drainage pan.


Additional Information

For additional information on fire fighting foam concentrates including C6 foams, foam testing, compatibility, shelf life and pack sizes, please refer to our FAQs section.

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UL listed UL 162 EN1568 34 LASTFIRE EPA 2015 compliant