EN 1568-2-2008 pdf download.Fire extinguishing media – Foam concentrates – Part 2:Specification for high expansion foam concentrates for surface application to water-immiscible liquids.
6 pH of the foam concentrate
The pH of the foam concentrate sampled in accordance with Annex B shall be not less than 6,0 and not
more than 9,5 at (20± 1) ‘C.
7 Surface tension of the foam solution
The surface tension (determined in accordance with F21) of the foam solutions prepared using top and bottom half-samples (see E4) of the foam concentrate sampled in accordance with Annex B and conditioned in accordance with Annex E shall be not less than 0,95 times and not more than 105 times the surface tension of the foam solution prepared using the sampled foam concentrate.
8 Spreading coefficient of the foam solutions
NOTE The spreading a)efficent indicates the possibility of film-forming, but it does not measure its quality. Certain properties of film-forming foams are not defined are note defined by this standard
8.1 Before temperature conditioning
The foam solution prepared using the concentrate, if it is daimed by the supplier to be ‘aqueous filmforming”, sampled in accordance with Annex B shall have a po&tive spreading coefficient over cyclohexane when tested in accordance with F.2.2.
8.2 After temperature conditioning
The foam solution prepared using top and bottom half-samples, see E.4, of the foam concentrate, if it is claimed by the supplier to be ‘aqueous film-forming”, sampled in accordance with Annex B and conditioned in accordance with Annex E, shall have a positive spreading coefficient over cyclohexane when tested in accordance with F.2.2.
9 Expansion and drainage of foam
9.1 Before temperature conditioning
The foam produced from the foam solution prepared from the foam concentrate sampled in accordance with Annex B, at the supplier’s recommended concentration with potable water shall be tested in accordance with Annex G. If appropnate, a further sample of the same concentration made with the simulated sea water in accordance with shall also be tested.
NOTE Expansion is dependent on the foam concentrate and the equipment used to make the foam. The test equipment of G.1 tends to give expansions higher than some other equipment so the expansion limit is above the 200 lImit for high expansion (see 3.5).
9.2 After temperature conditioning
The foams produced from the solutions prepared with potable water by using top and bottom half- samples, see E.4, of foam concentrate, sampled in accordance with Annex B, at the supplier’s recommended concentration, when tested in accordance with Annex G. shall have the following:
a) expansions which do not differ from each other or from the value obtained in 9.1 using potable water (;e. before temperature conditioning) by more than 20 % of the value obtained In 9.1 using potable water and
b) 25 % drainage times which do not differ from each other or from the value obtained in 9.1 using potable water (i.e. before temperature conditioning) by more than 20 % of the value obtained in 9.1 using potable water.
If appropriate repeat the tests using top and bottom half-samples, see E.4, of foam concentrate, sampled in accordance with Annex B, at the supplier’s recommended concentration, using foam solutions prepared with the simulated sea water in accordance with G.4. These foam solutions shall have the following:
C) expansions which do not differ from each other or from the value obtained In 9.1 using the simulated sea water (i.e. before temperature conditioning) by more than 20 % of the value obtained in 9.1 using the simulated sea water in accordance with G.4; and,
d) 25 % drainage times which do not differ from each other or from the value obtained in 9.1 using the simulated sea water (i.e. before temperature conditioning) by more than 20 % of the value obtained In 9.1 using the simulated sea water in accordance with G.4.
10 Test fire performance
The foam produced from foam solution, prepared using the foam concentrate sampled in accordance with Annex B at the supplier’s recommended concentration with potable water, and if appropriate at the same concentration with the simulated sea water of G.4, shall have an extinction time not more than 150 s when tested in accordance with H.1 and H.2.
NOTE The values obtained with sea water can differ from those obtained with potable water.EN 1568-2-2008 pdf download.