3M™ cold shrink splice jacket kits SJ series are a series of open ended, tubular, rubber sleeves that combined with Scotch® rubber mastic tape 2228 provide a sealed jacket over cable splices installed on jacketed power cable. The Scotch® rubber mastic tape 2228 helps assure a seal between the cable jacket and the cold shrink jacket tube. It is also used to seal around a cable ground conductor. The cold shrink jacket tube is provided in an expanded state, mounted on two inner supporting plastic cores. As supplied in this prestretched condition, the tube is ready for field installation. The jacketing tube is made of EPDM rubber which contains no chlorides or sulfurs. Three kit sizes cover an application range of 0.95 to 4 (24 to 102 mm).