The hot-melt adhesive inner tube bonds to both the fiber and the heat shrinkable outer tube to encapsulate the fusion splice joint and provides vibration damping and an environmental seal, protecting the fiber from damage and contaminants. Our fiber optic fusion splice protector sleeves are manufactured pre-shrunk in a heat-bonded assembly that consists of three components:. This specialized tubing is designed to protect and secure optical fibers, providing a durable and reliable layer that can withstand the harsh environments commonly encountered in telecommunications. Outer tube encloses and captures fusion tube and rod.