Butyl mastic tape 1.used to seal joints or terminal on optical cable 2.filling,insulation,waterproof,sealing,tr Butyl mastic tape1.peeling the ... air leakage efficiently.5.Size : 50mmX2mmX600mm, 60mmX2mmX600mm , 60mmX2.5mmX600mm6.Material : Butyl Rubber,Isprene Isobutylene Copolymer.