Heat-shrink fiber optic splice closure uses a material that shrinks when heated to form a tight seal around the fiber optic cable, protecting the splice point from moisture, dust, and mechanical damage. First, it protects against environmental hazards such as moisture, dust, and debris that can damage delicate fiber optic cables. Effective sealing ensures the longevity and reliability of the network. It is well suited to accommodate a maximum of 96 fibres for various splice applications such as track (backbone), spur (branch) or distribution points. The scope of application is: aerial, underground, pipeline, hand-holes. The ambient temperature ranges from -40 to 65°C.