The heat shrink tubes features: Cross-linked polyolefin and hot fusion material with a stainless reinforced steel rod. Preserves optical transmission performance and provides safe protection for fiber optic splicing. Easy installation to avoid fiber damage. The edge is polished to make it completely free of burrs to prevent breakage when shrinking. 304 grade has better Moisture &. Fiber Heat Shrink Tube, also referred to as Fiber Splice Tubes, Fusion Protection Tube, or Splice Protection Tube, plays a crucial role in modern communication networks. The protection sleeve is meant to protect the splice joint and exposed fiber after the splice has been completed.