Foam testing service

Foam Compatibility

NFPA 11

NFPA 11: 2016 Edition makes the following recommendations:

  • Different brands of the same type of concentrate shall not be mixed unless data are provided by the manufacturer ... to prove that they are compatible.” (Para. 4.4.1.2)
  • Different types of foam concentrates shall not be mixed for storage.” (Para. 4.4.1.1)

Foam Compatibility

In accordance with NFPA 11: 2016, quality foam concentrates of the same type from different suppliers can be mixed, provided that the supplier presents a Certificate of Compatibility (C of C).

Compatibility testing consists of:

  • Freeze / thaw ageing
  • Physical property evaluation
  • Fire Tray performance testing

To be given a C of C, the foam concentrate should show no reportable adverse reactions.

For further information or to request a copy of any of our Certificates of Compatibility, please contact us.


Please note:

  • Quality foam usually refers to those tested and accredited to International Standards
    such as UL 162 or MIL-F-24385-F.
  • We recommend that Alcohol Resistant (AR) foams are never mixed.
  • In order to maintain EPA 2010/15 compliancy, it is recommended that C6 foams are not mixed with any other foams.