Optical fiber cable with improved fire protection performance
AssigneeCorning Research & Development Corporation
InventorsEmanuela Gallo, Michael Alexander Heinz, Tomasz Kazmierczak, Kirsten Langfeld
Life of this patent
Estimating the term…
Abstract
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.
Claims14
An optical fiber cable with improved fire protection performance, comprising:
- a cable core including at least one optical transmission element to transfer light;
- a cable jacket surrounding the cable core, wherein the cable jacket comprises a multilayered structure having a first sheath layer and at least a second sheath layer being surrounded by the first sheath layer, wherein the material of the first sheath layer and the material of the second sheath layer are halogen free, and wherein 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;
- and
- wherein the material of the first sheath layer includes a first flame retardant additive of at least one of an intumescent-acting material and a mineral filler and a gas-phase active material and a condensed-phase active material, and wherein the material of the at least one second sheath layer includes a second flame retardant additive of at least another one of the intumescent-acting material and the mineral filler and the gas-phase active material and the condensed-phase active material.
An optical fiber cable with improved fire protection performance, comprising:
- a cable core including at least one optical transmission element to transfer light;
- a cable jacket surrounding the cable core, wherein the cable jacket comprises a multilayered structure having a first sheath layer and at least a second sheath layer being surrounded by the first sheath layer, wherein the material of the first sheath layer and the material of the second sheath layer are halogen free, and wherein 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;
- and
- wherein the cable core comprises a plurality of the at least one optical transmission element and a strength member, wherein each of the optical transmission elements includes a plurality of optical fibers surrounded by a buffer tube, wherein the optical transmission elements are placed around the strength member, wherein the cable jacket includes a bedding compound including a mineral filler, and wherein the bedding compound is placed in gaps between the optical transmission elements.
Dependencies are inferred from the claim text.