Light Armored Outdoor Fiber Optic Cable GYTA For Duct Pipe Line Underground Direct Burial

1. Central Strength Member (CSM):

A phosphatized steel wire sits at the center of the core to absorb tensile load. For higher fiber counts, it may be upjacketed with a polyethylene (PE) layer to match core geometry.

2. Optical Fibers:

Standard 250µm bare fibers, typically conforming to G652D single-mode specifications (Single mode G657, G655 and Multimode fiber are also used).

3. Gel-Filled Loose Tubes:

The fibers are contained in high-modulus PBT (polybutylene terephthalate) loose tubes filled with a thixotropic, water-resistant gel to act as a physical buffer and moisture block.

4. SZ Core Stranding:

The loose tubes (and any necessary solid plastic fillers) are helically stranded around the CSM using an SZ pattern. The interstitial gaps within the stranded core are packed with a water-blocking filling compound.

5. Inner Moisture Armor (APL):

An Aluminum Polyethylene Laminate (APL) tape is applied longitudinally over the stranded core. This acts as a radial moisture barrier and provides crush resistance.

6. Outer Jacket:

A dense, black, UV-resistant Polyethylene (PE) outer sheath is extruded over the APL tape to protect the entire assembly from abrasion, environmental weathering, and solar degradation.