SealBoss® 1570 LV WaterStopFoam mixed with SealBoss® 15x Accelerator is a super low viscosity, flexible, hydrophobic, water-activated (hydro-active), water cut-off grout and foam seal grout based on 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 minimum of 10% SealBoss® 15x Accelerator and a maximum of 20% SealBoss® 15x Accelerator. SealBoss® 1570 LV WaterStopFoam is NSF/ ANSI Drinking Water Contact Approved. Upon contact with water SealBoss® 1570 LV WaterStopFoam reacts to a flexible foam while expanding its volume 8 to 25 times. The cured material is of a constant volume. Since water is not a component of the foam structure, the cured material is essentially not effected by water or dryness. The reacted material does not shrink or swell. Depending on the amount of accelerator added, the injection pressures, structure and confinement properties, SealBoss® 1570 LV WaterStopFoam reacts to a dense, closed cell, semi flexible product. SealBoss® 1570 LV WaterStopFoam is designed for sealing seeping water leaks and for cutting off water in cracks and joints. Due to the low viscosity of the material, SealBoss® 1570 LV WaterStopFoam offers superior penetration in hairline crack injection. The product is suitable for the filling of spaces, cracks and honeycombing in stone or concrete structures. To achieve most satisfying and permanent results in certain applications, a combination of SealBoss® 1570 LV WaterStopFoam with other systems of our product line may be advised. Ask your SealBoss technician for details. The product is for professional use.