IEC tested | OEM supply | Global export
Composite Insulators for Reliable High-Voltage Lines
Lightweight silicone rubber insulators with fiberglass cores and steel end fittings, engineered for transmission lines, substations and railway systems in polluted or harsh environments.
Choose by Project Type
Make procurement easier by matching the insulator form to voltage, mechanical load, pollution level and fitting requirements.
Long Rod
For overhead transmission lines with high tensile load and long-span requirements.
Line Post
For distribution poles, compact line design and improved contamination performance.
Station Post
For substations, switchgear supports and equipment insulation structures.
Railway
For traction power and catenary systems requiring vibration-resistant insulation.
Why EPCs and Utilities Standardize on Our Composite Insulators
Lower installed weight
Silicone rubber housing maintains hydrophobicity for 25+ years, even in salt-fog, desert, and industrial zones. Zero washing required.
Pollution performance
Silicone rubber housing maintains hydrophobicity for 25+ years, even in salt-fog, desert, and industrial zones. Zero washing required.
Customization Without Compromise
Ball-socket, tongue-clevis, flange, Y-type — any end fitting to your drawing. SML 70–550 kN. Custom creepage distance. RAL color match available.
Documentation That Passes Tenders
Every shipment includes: type test report, mill certificate, packing list, certificate of origin, IEC compliance, and (if required) third-party inspection report
Technical Snapshot
| Series | Voltage Range | Core / Housing | Common Tests |
|---|---|---|---|
| Composite long rod | 110kV – 1000kV | Fiberglass + silicone rubber | Tensile, electrical, salt fog, UV aging |
| Composite line post | 11kV – 230kV | FRP rod + silicone sheds | Bending load, leakage current, tracking |
| Composite station post | 11kV – 800kV | High-strength core + metal fittings | Cantilever, impulse, power frequency |
Applications
Clear application blocks help buyers quickly confirm whether the product fits their purchasing scenario.
Transmission Lines
Supports conductors while reducing arcing and flashover risk along high-voltage corridors.
Substations
Used as isolating supports for busbars, equipment and surge-protection assemblies.
Electrical Equipment
Integrated with switchgear, transformers and circuit breakers to maintain safe clearance.
Buyer FAQ
FAQ content captures long-tail SEO searches and reduces repeated pre-sales questions.
Composite vs polymer?
Composite usually means fiberglass core, polymer housing and metal fittings; polymer-only designs may suit lighter loads.
Can fittings be customized?
Yes. Provide drawings, load requirements, creepage distance and matching hardware details for review.
What documents are available?
Datasheets, type test reports, packing details and export documents can be prepared for shipment.
Send your voltage class, fitting type and quantity.
ZZNH Power can prepare a tailored recommendation and quotation for your project.