Developed for maximum adhesion to most surfaces, 250-H Butyl Tape provides excellent performance in areas where joint movement, expansion and contraction are present. Features and BenefitsSelf-sealingNo VOCsMeets ASTM-E-84Resistant to water, acid vapors 100 ppm and alcoholsForms to irregular surfaces-40 250F (-40 121C)Custom sizes available unlimited profiles in extruded tapesForms an air and water tight seal while conforming to irregular surfacesEasy application for instant cost and labor savings