SealBoss ® 1510 Water Stop Foam mixed with 15x Accelerator is a 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 15x Accelerator. A phthalate free formulation (F) is available. 1510 Water Stop Foam is NSF/ ANSI 61 Drinking Water Contact Approved.