SealBoss® 1570 WaterStopFoam mixed with SealBoss® 15x Accelerator is a flexible hydrophobic, water-activated (hydro-active), water cut-off grout and foam seal grout based on a MDI polyurethane. The resin is 100% solvent free and 100% solids. The gel-time of the product is adjustable by the mandatory adding of a certain percentage of SealBoss® 15x Accelerator. A phthalate free formulation (F) is available. SealBoss® 1570 WaterStopFoam is NSF/ANSI 61 Drinking Water Contact Approved.