In the standard flame-resistant optical fiber cable for mine use, the fibers are positioned in a loose tube made of high modulus plastic. The tubes are filled with nonwoven fabrics of high density water-resistant filling compound. A steel wire, sometimes sheathed with polythene for cable with high fiber count, locates in the center of core as a metallic strengthening member. Tubes are stranded around the strengthening member into a compact and circular cable core. The PSP is longitudinally applied over the cable core which is filled with the filling compound to protect it from water ingress. Then a PE sheath is applied. At last, the cable is completed with a blue PVC sheath.

• BT Loose tube, steel structure: Robust design for demanding environments.
• Flame Retardant Sheath: Selection of halogen-free flame retardant sheath, suitable for all kinds of coal mines.
• Excellent Performance: Superior mechanical and temperature performance guaranteed by accurate excess fiber length.
• Critical Protection: Excellent hydrolysis resistance and strength performance of tube material with special filling compound.