Length 30 meters, thickness 10mm, width 20mm. Masterseal 910 30meter in a roll. Masterseal 910 is a Hydrosweling WaterBar, ready for installation,to Waterproof joints in concrete structures. The product is based on a special polymer technology that acts by swelling on exposure to water, to form a seal and render the joints leak-proof.masterseal 910 Hydroswelling waterbar is suitable for all construction joints subject to hydrostatic pressure, on one or both sides. Application areas lnclude joints between; Abutments of concrete and rock, masonry etc. Rafts and walls in tunners and basements. Steel and concrete plpes, H-king, precast elements etc.