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LSZH Low Smoke Zero Halogen Fiber Optic Cable
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Low Smoke Zero Halogen (LSZH) Cables
Low smoke zero halogen, referred to as LSZH, LSOH, LS0H, LSFH and OHLS, is a material classification of optical cable sheaths in the optical fiber and cable industry. Low-smoke halogen-free optical cable sheath is composed of thermoplastic or thermosetting material with low smoke emission when heated and halogen-free itself. As early as the mid-1980s, halogen-containing (especially brominated) flame-retardant polymer systems were widely used in the wire and cable industry due to their outstanding flame-retardant effects, among which polyvinyl chloride (PVC) is one of the best For example, but one disadvantage of PVC is that it will release a lot of smoke when it is burned, and it will produce serious corrosive and toxic gases. Therefore, cables are now made of low-smoke and halogen-free materials. LSZH (Low Smoke Zero Halogen) material has some obvious advantages of low smoke, low toxicity, low corrosion, and high flame retardancy.
Halogen is a group VIIA element on the periodic table of elements (IUPAC new definition: group 17), including fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and (Ts). The tensile strength of the LSZH optical cable sheath is higher than that of ordinary PVC optical cables, good fire resistance (-30°C~105°C), good softness (hardness 80-90), no toxic black smoke will be produced when burning without adding plasticizers ( A small amount of white smoke will be produced)
Low smoke zero halogen, referred to as LSZH, LSOH, LS0H, LSFH and OHLS, is a material classification of optical cable sheaths in the optical fiber and cable industry. Low-smoke halogen-free optical cable sheath is composed of thermoplastic or thermosetting material with low smoke emission when heated and halogen-free itself.
Most wire wraps are composed of polyethylene, polyvinyl chloride or thermoplastic polyurethane. Chlorine-containing plastics will release toxic hydrogen chloride in case of fire, and produce hydrochloric acid in case of contact with water. The low-smoke and halogen-free materials will not release hydrogen halide or other acids when they are on fire.
Low-smoke and halogen-free materials reduce the generation of toxic and corrosive gases when they burn. Low-smoke and halogen-free materials are often used in poorly ventilated environments such as airplanes, train carriages, or ships. Low-smoke, halogen-free materials are also commonly used in the railway industry, because there will be high-voltage lines under the railway or signal lines that transmit the position of the train. The use of low-smoke and halogen-free materials also reduces the accumulation of toxic gases when the circuit is damaged due to fire or short circuit.
Huihongfiber is professional manufacturer of LSZH fiber optic cables and patch cords, we have indoor and outdoor LSZH fiber cables and cable assemblies, welcome to contact us for your LSZH fiber cables needs.
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Halogen-free flame-retardant optical cable is to replace the polyethylene sheath material of ordinary optical cable with flame-retardant polyethylene sheath material, so that the optical cable has flame-retardant performance, and the structural size and transmission performance. Machinery and environment communicate with ordinary optical cables. In order to ensure the reliable operation of communication equipment and networks in places requiring low-smoke, halogen-free flame retardant, it is necessary to effectively solve the problem that the polyethylene sheath is flammable in case of fire, and that dripping will cause fire hazards, and that the flame-retardant PVC sheath will be damaged in a fire. It is easy to release a large amount of black smoke and toxic gas, causing problems such as “secondary” environmental pollution and difficulty in escaping. The structural forms of the halogen-free flame-retardant optical cable include layered stranding type, central tube type, skeleton type or indoor soft optical cable, which can be a metal-strengthened optical cable or a non-metallic-strengthened optical cable. The structure of the flame-retardant optical cable is to insert single-mode or multi-mode optical fibers into a loose tube made of high-modulus plastic, and the tube is filled with a water-blocking compound.