OPTICAL FIBER CABLE HAVING A SHEATH OF A FLAME RETARDANT COMPOSITION

摘要

IT IS AN OBJECT OF THE PRESENT INVENTION TO PROVIDE AN OPTICAL FIBER CABLE WHICH CAN RELIABLY PREVENT INCREASED TRANSMISSION LOSS DUE TO DAMAGE OF THE OPTICAL FIBER AS A RESULT OF THE EGG-LAYING BEHAVIOR OF CICADAS. THE CABLE INCLUDES AT LEAST AN OPTICAL FIBER (1), TENSION MEMBERS (6) AND A SHEATH (3). THE SHEATH (3) HAS A SHORE D HARDNESS OF 55 OR MORE AND A MINIMUM DISTANCE L FROM A SURFACE OF THE OPTICAL FIBER (1) TO AN OUTER SURFACE OF THE SHEATH (3) OF GREATER THAN 0.3 MM. FURTHER, IN THE CABLE, THE SURFACE OF SHEATH (3) HAS A COEFFICIENT OF FRICTION OF 0.45 OR LESS AND THE SHEATH (3) HAS A SHORE D HARDNESS OF 57 OR MORE. IN ADDITION, THE CABLE IS MADE BY USING A SPECIFIC FLAME RETARDANT COMPOSITION (P) AS THE SHEATH MATERIAL.