Disclosed is a fire resistant, all dielectric fiber optic cable with high fiber count. The cable comprises a core including a central strength member and buffer tubes containing fibers, arranged around the central strength member. A first mica layer is arranged around the core. A glass yarn layer surrounds the first mica layer and is in direct contact therewith. A inner sheath surrounds the glass yarn layer. A second mica layer surrounds the inner sheath. An outer sheath surrounds the second mica layer. The buffer tubes contain a water-blocking filling material comprising a silicone gel, wherein said silicone gel has a drop point of at least 200° C.

Embodiments of an optical fiber cable are provided. The optical fiber cable includes at least one optical fiber, a buffer tube surrounding the at least one optical fiber, and at least one tensile element wound around the buffer tube. The at least one tensile element has a laylength of at least 200 mm. The optical fiber cable also includes an exterior jacket surrounding the tensile element. The exterior jacket is made up of at least one polyolefin, at least one thermoplastic elastomer, and at least one high aspect ratio inorganic filler. Further, the exterior jacket has an averaged coefficient of thermal expansion of no more than 120(10.sup.−6) m/mK.

Embodiments of the disclosure relate to an optical fiber cable. The optical fiber cable includes a cable jacket having an interior surface and an exterior surface. The interior surface defines a central bore extending along a longitudinal axis of the optical fiber cable, and the exterior surface defines an outermost surface of the optical fiber cable. At least one subunit is disposed within the central bore. Each of the at least one subunit includes at least one optical fiber disposed within a buffer tube. A plurality of ultrahigh molecular weight polyethylene (UHMWPE) tensile yarns are positioned around the at least one subunit and extend along the longitudinal axis. A layer of a bedding compound is disposed between the plurality of UHMWPE tensile yarns and the cable jacket.

Embodiments of the disclosure relate to an optical fiber cable. The optical fiber cable includes a subunit having a first interior surface and a first exterior surface. The first interior surface defines a central bore along a longitudinal axis of the optical fiber cable. At least one optical fiber is disposed within the central bore of the subunit, and a plurality of strengthening yarns is disposed around the subunit. A cable sheath disposed around the plurality of strengthening yarns. The cable sheath has a second interior surface and a second exterior surface. The second exterior surface defines an outermost surface of the optical fiber cable. The cable sheath includes from 55% to 68% by weight of a mineral-based flame retardant additive and from 35% to 45% by weight of a polymer blend. The polymer blend includes a co-polyester or co-polyether and a polyolefin or a polyolefin elastomer.

Embodiments of a flame retardant composition are provided. The composition includes from 55% to 85% by weight of a blended matrix and from 15% to 45% by weight of a flame retardant package distributed within the blended matrix. The blended matrix includes a polyolefin component and a nitrogen-containing polymer component. In particular, the nitrogen-containing polymer component has a melting temperature of less than 240° C. The flame retardant package includes an acid source, a carbon source, a polyoxometalate ionic liquid, and a synergist. The flame retardant composition can be utilized in cables, such as fiber optic cables.

An optical fiber cable includes a central element, extending along a longitudinal axis of the optical fiber cable, and a plurality of routable subunits, each routable subunit having a rigidly stranded ribbon stack and a tight buffer layer surrounding the ribbon stack, wherein the subunits are SZ-stranded around the central element to form a cable core. A binder film continuously and contiguously surrounds the plurality of routable subunits along the longitudinal axis and a cable sheath continuously and contiguously surrounds the binder film along the longitudinal axis, wherein the cable sheath has an inside surface and an outside surface, the inside surface defining an elliptical shape and the outside surface defining a generally circular shape

A fiber optic cable includes an optical fiber element including a core and cladding layer. A strength member layer is positioned over the optical fiber element and includes a layer of fiber elements composed of at least 25% high temperature fiber material. An outer jacket layer is positioned over the strength member layer and is formed of a highly flame-resistant material.

Embodiments of the disclosure relate to an optical fiber cable. The optical fiber cable includes a subunit having a first interior surface and a first exterior surface. The first interior surface defines a central bore along a longitudinal axis of the optical fiber cable. At least one optical fiber is disposed within the central bore of the subunit, and a plurality of strengthening yarns is disposed around the subunit. A cable sheath disposed around the plurality of strengthening yarns. The cable sheath has a second interior surface and a second exterior surface. The second exterior surface defines an outermost surface of the optical fiber cable. The cable sheath includes from 55% to 68% by weight of a mineral-based flame retardant additive and from 35% to 45% by weight of a polymer blend. The polymer blend includes a co-polyester or co-polyether and a polyolefin or a polyolefin elastomer.

An optical fiber cable comprises a cable core including at least one optical transmission element to transfer light, and a cable jacket surrounding the cable core. The cable jacket is embodied as a multilayered structure having a first sheath layer and at least a second sheath layer being surrounded by the first sheath layer. The material of the first and the second sheath layer is halogen free. The material of the first sheath layer and the material of the second sheath layer have a different flame retardant additive providing different flame retardant mechanisms.

A transition for an optical fibre cable (11) through a partition. The optical fibre cable (11) is received inside a shield pipe (1, 4), which shield pipe (1, 4) is of an electrically conductive material. The shield pipe (1, 4) is received in an axial through opening (6, 21) of the holding means. One end of the shield pipe (1, 4) is received inside a holding means having a sealing function.