| 摘要 |
Optical fiber cable having high tracking resistance, comprising at least one optical fibre (6) and a polymer-based extruded double-layer outer sheath (4), comprising a first inner polymer layer (4a) substantially without tracking resistance, and a second outer polymer layer (4b) having characteristics of high tracking resistance, obtainable preferably by adding a predetermined quantity of an inorganic oxide, preferably in the hydrated or hydroxide form, to the polymer matrix. In this way it is possible to produce an optical fiber cable which has high tracking resistance, is light, has high mechanical strength, and is particularly suitable for installation along high-voltage overhead lines.
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