Rockmax Swelling 101 is a hydrophilic swelling waterstop. The based material is bentonite clay with polymer rubber. The product swell when contact with water create more than 300% expansion. The release benonite fill void between the two portion of concrete joint. Use in basement slab, wall, retaining wall, pile cap. 25mm x 20mm x 6meter (30meter per box) 20mm x 10mm x 9meter (54meter per box).