Drain Time 3 : The time that it takes for a specified percent (customarily 25 percent) of the total solution that is contained in the foam to revert to liquid and drain out of the bubble structure
NFPA 1145 Guide for the Use of Class A Foams in Manual Structural Fire Fighting, 2006 ed. (Guide: Use of Class A Foams in Manual Stru Fr Fight - Amer) {386 NFC}