Product Description: Hydrotite is the brand name for a state of the art hydrophilic waterstop with unmatched durability and water sealing capacity. Hydrotite expands as it absorbs water and fills up concrete joint gaps conforming to the gap variation, ensuring excellent sealing. Hydrotite is based on the technology of hydrophilics, a material which expands in a controlled fashion by approximately eight times by volume in the presence of moisture to create a pressure seal within the joint, when properly installed.