IsoStop A is a single component polyurethane product which reacts on contact with water intended for Sealing against water ingress and general sealing work. IsoStop A is intended for sealing large water inflows. The addition of an accelerator during product application increases the reaction speed. IsoStop A is injected into the ground by means of a manual or mechanical pump. Once the product has been injected, any contact with water produces rigid foam, which effectively seals the treated area.