A halogen-free type protective tube. A tube that can be used for marking.[Features]· A non-shrinking, irradiated soft flame-retardant polyolefin tube that does not contain harmful substances, such as specific bromine and nitrogen.· The material is a crosslinked soft flame-retardant polyolefin resin.· A completely halogen-free, flame-retardant (no chlorinated/specific brominated flame retardants), non-shrinkable tube.· Appropriate for marking — lettering is not easily erased.· Usable for automotive products, harness insulation, protection and prevention against corrosion/electrolytic corrosion.· Usable for wire terminals and contacts, and prevention against corrosion/electrolytic corrosion.