What is a composite insulator?

Composite insulators combine a fiberglass core rod, silicone-rubber housing and metal end fittings; used to support and insulate overhead lines and equipment.

Do you provide IEC test reports?

Yes — we supply IEC/ISO test reports (salt fog, UV, tensile, electrical) and export documentation on request.

Composite Insulators / Polymer Insulators — OEM Manufacturer

Leading Polymer Insulator Manufacturer in China
Export-ready

Composite insulators keep conductors clear of grounded structures while withstanding mechanical load and pollution. Each unit pairs a glass-fiber core with a molded silicone housing and steel end fittings. We test rods and fittings for tensile load, leakage, and salt-fog resistance.
Use these insulators on long-span transmission lines, substations and rail systems where durability and low maintenance matter. We offer custom end fittings, IEC test reports and export packaging. Contact us for datasheets, sample testing or a tailored quote.

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Buy Polymer & Composite Insulators — OEM Supply & Global Export

ZZNH Power supplies high-performance polymer and composite insulators for transmission and distribution systems worldwide. We offer custom fittings, export-ready packaging, competitive lead times and full test reports — contact us for a fast quotation.

IEC / ISO tested — salt fog, UV, tensile & electrical tests
Customizable end fittings & core lengths for OEM projects
Export documentation (CO, BL, Packing List) and international shipping
Competitive pricing for bulk orders & steady production capacity

Lightweight construction that lowers material and transportation costs.

Strong resistance to flashover and UV-induced aging.

Designed to prevent explosive failure, improving operational safety.

Tough, non-brittle materials that reduce the chance of field damage.List item

Hydrophobic surface properties that limit leakage current and surface discharges.

Excellent dielectric performance with reduced creepage distances.

High seismic and vibration resilience for reliable operation in harsh conditions.

Essentially maintenance-free with superior pollution tolerance.

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Transmission lines
Commonly installed along high-voltage transmission corridors to prevent arcing and flashover events that can cause outages or damage conductors and towers.

Substations
Used in substation equipment as isolating supports, bushings, and components of surge-protection systems, providing insulation and protecting assets from transient overvoltages.

Electrical equipment
Integrated into switchgear, transformers and circuit-breakers to maintain clearance between live parts, ensuring safe, reliable operation of critical power-system components.

What Are the Differences Between Composite Insulator andPolymer Insulator?

Composition: Composite = fiberglass/core + polymer housing + metal end fittings. Polymer insulator = all-polymer (silicone/EPDM), no internal core.
Strength & weight: Composite = stronger, heavier. Polymer = lighter, less mechanical strength.
Corrosion & maintenance: Composite has metal fittings that can corrode; polymer-only resists corrosion better.
Cost & use: Composite is more expensive and used for high-tension or heavy-load lines; polymer insulators suit lighter loads and lower cost.

What Are Composite Insulators?

Definition: Composite insulators are overhead-line insulators made of a strong core (usually fiberglass) covered by a polymer housing; they serve as special insulating supports on transmission lines.
History: They began appearing in the 1950s; China started producing silicone-rubber types around 1967.
Main types: Classified as line (overhead) or substation (power-station) insulators, and by form—rod (post), suspension (rod-type), needle, cross-arm, wind-deflecting, etc.
Primary functions: Support conductors mechanically and prevent leakage/flashover under electrical and environmental stress.
Trend/use: Demand has risen with large UHV transmission projects, so composite insulators are increasingly used on high-voltage lines.

Composite Insulators / Polymer Insulators — OEM Manufacturer

Leading Polymer Insulator Manufacturer in China Export-ready

Buy Polymer & Composite Insulators — OEM Supply & Global Export

Leading Polymer Insulator Manufacturer in China
Export-ready