Colossus®Bentostrip is a hydrophilic joint sealant composed of natural sodium bentonite clay and butyl rubber. The Colossus® Bentostrip joint sealants are used for the waterproof sealing of construction joints in concrete. According to the type the sealant can be used in both fresh water andor salt water applications, making the Colossus® Bentostrip joint sealants very versatile.