Blue Hydrotite has the capability to swell up to 8 times its original size upon contact with water. The extent to which this capacity is used is limited by the Hydrotite profile used, the availability of water and the space required to accommodate the expansion. This high expansion capacity provides a significant factor of safety for sealing construction joints. Due to design limitations, other commercially available hydrophilic sealing materials swell up to only twice their original size. This reduced expansion capacity, relative to Hydrotite, requires that large profiles be used, which are less effective when compared with the expansion capacity of blue Hydrotite.