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Optical Fiber Cable Compound Suppliers

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Coming From China, Marketing To The World.

Hangzhou Meilin New Material Technology Co., Ltd. is China ODM/OEM Optical Fiber Cable Compound Suppliers and Wholesale Optical Fiber Cable Compound, we were established in July 1994 (formerly known as Zhejiang Lin'an Hongyan Plastic Factory). The company has two factories located at 619 Linglongshan Road and 259 Xingyu Street, Lingqiu Street, Linglong Industrial Park, Lin'an District, Hangzhou City. The registered capital of the company is 75 million yuan, covering an area of over 18000 square meters and a building area of over 30000 square meters. Currently, modern industrial factories and 18 advanced automated production lines have been built. The new factory area will be produced in 2021, making it the cleanest and most beautiful professional cable material manufacturer in the entire region—agreement conditions.

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Optical Fiber Cable Compound Industry Knowledge

Key materials and technologies of optical fiber cable composites: analysis of sheath and buffer layer

Functions of sheath and buffer layer:

Sheath: mechanical protection (pressure resistance, wear resistance), environmental isolation (moisture resistance, UV resistance).
Buffer layer: stress buffering, microbending loss control, bonding medium between optical fiber and sheath.
Core indicators of composite performance: tensile strength, flexibility, thermal stability, dielectric properties.

Sheath materials and technologies

Mainstream material classification

Polyvinyl chloride (PVC):
Advantages: low cost, easy processing, flame retardant (flame retardant added).
Disadvantages: halogen (toxic when burned), poor temperature resistance (-20℃~+70℃).

Low smoke zero halogen material (LSZH):
Advantages: low smoke and non-toxic in case of fire (in compliance with IEC 60754/61034).
Formula: aluminum hydroxide (ATH) flame retardant + polyolefin matrix (such as PE/EVA).

Polyurethane (TPU):
Advantages: high elasticity, oil/cold resistance (-50℃~+90℃), suitable for military/submarine cables.
Others: cross-linked polyethylene (XLPE, high temperature resistance), nylon (wear resistance).

Key to sheathing process

Extrusion technology:
Thickness uniformity control in high temperature melt extrusion (eccentricity ≤5%).
The effect of cooling method (water cooling/air cooling) on ​​crystallinity.

Adhesion optimization:
Adhesive between sheath and optical fiber/strength member (such as maleic anhydride grafted polymer).

Buffer layer materials and technology

Buffer layer functions and types
Tight buffer:
Material: modified PBT (polybutylene terephthalate), PVC.
Features: Directly coat optical fiber, strong mechanical protection, but low flexibility.

Loose tube buffer:
Material: water-blocking gel + polyester tape (PET).
Features: The optical fiber "floats" in the tube to reduce stress/microbend loss.

Technical Challenges and Innovations
Stress Matching: The modulus of the buffer layer needs to be between the optical fiber and the sheath (such as PBT modulus ~2-3GPa).

Water-blocking design:
Dry water-blocking: Super absorbent powder (SAP) coating.
Wet water-blocking: Petroleum jelly filling (needs to be compatible with the buffer layer material).

Industry Application Cases

Data Center: LSZH sheath + tight-fitting PBT buffer (high-density wiring, fire protection requirements).
Submarine cable: TPU sheath + loose-fitting water-blocking design (pressure resistance, salt corrosion resistance).
5G base station: ultra-flexible sheath (TPE) + micro-tube buffer (resistant to repeated bending).