Abstract: A halogen-free flame-retardant heat-shrinkable tube with high expanding property having the surface with excellent marking property and printability is provided. The tube includes an outer layer mainly made of polyolefin resin blended at the ratio of 100 parts by weight of a polyolefin resin and 100 to 250 parts by weight of metal hydroxide or that which is surface-treated with a silane coupling agent and an inner layer mainly made of polyolefin resin blended at the ratio of 100 parts by weight of a polyolefin resin and 100 to 250 parts by weight of metal hydroxide which is surface-treated with an anionic surface-active agent.

Abstract: An adhesive tube, a composite tube comprising a heat-shrinkable tube having on the inner surface thereof the adhesive tube, and a method for sealing an object having an uneven surface comprising the steps of: inserting the object in the composite tube and then heating the composite tube. The adhesive tube comprises a double-layered thermoplastic resin layer comprising an outer layer and an inner layer, the outer layer having a melt index smaller than that of the inner layer.

Abstract: The invention relates to a multi-layer foam heat-shrinkable tube comprising a hot-melt adhesive layer as the innermost layer, at least one non-foam layer and at least one foam layer provided on an outside surface of the hot-melt adhesive layer. The invention also relates to a method for producing a multi-layer foam heat-shrinkable tube comprising extruding a hot-melt adhesive layer as the inner most layer, at least one non-foam layer, and at least one foam layer to form a multi-layer foam tube, heating and expanding the inner diameter of the multi-layer foam tube, and cooling the expanded multi-layer tube while an inner diameter of the tube at the expanded state is maintained. The non-foam layers and foam layers can be provided in any number and any order.

Abstract: Heat-shrinkable two-layer tubing comprising (a) an outer layer comprising a crosslinked resin composition comprising a fluorine-containing resin containing a vinylidene fluoride unit as a base polymer and a polyfunctional monomer containing at least two unsaturated double bonds in the molecule thereof, and (b) an inner layer having provided on the inner wall of the outer layer comprising a fluorine-containing resin composition. The tubing is excellent in heat resistance and chemical resistance and exerts an excellent sealing effect on heating.

Abstract: A method of manufacturing a heat-shrinkable foam tube, wherein a two-layer tube, having a foaming agent outer layer and non-foaming inner layer, is extruded and heated simultaneously to activate the foaming agent. This process condenses the two steps of extruding and foaming into one step and results in a tube which can be manufactured to exact and consistent standards and be shrunk onto a pipe at a low temperature in a short period of time.