25% (50%) Drainage Time

25% (50%) drainage time is the time for 25% (50%) of the liquid content of a foam to drain out.

Source:  IMO MSC.1/Circ.1312, Revised Guidelines for the performance and testing criteria, and surveys of foam concentrates for fixed fire-extinguishing systems, 10 June 2009, International Maritime Organization. Regulatory Guidance 

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