Стержень сердечника, термостойкий тип, кислотостойкий тип
As a globally leading supplier of composite insulator components, we operate a complete in-house FRP core rod production line. We supply core rods complying with power industry standard DL/T 1580-2021 Technical Specifications for Cores of Composite Insulators for AC and DC Systems and machinery industry standard JB/T 10944—2010 Glass Fiber Reinforced Pultruded Profiles for Electrical Insulation — FRP Core Rods for Composite Insulators.
Our core rods fully satisfy acceptance requirements of relevant composite insulator standards both domestically and internationally.
| Chinese National Standards | IEC Standards | ANSI/IEEE Standards |
| GB/T 19519-2014 GB/T 20142-2006 GB/T 25096-2010 GB/T 22079-2019 GB/T 21421.1-2021 | IEC 61109:2025 IEC 61952:2008 IEC 62231-2020 IEC 62217:2025 IEC 61466-1:2016 | ANSI C29.13-2020 / IEEE 1207-2019 ANSI/NEMA C29.18-2022 ANSI C29.19-2020 IEEE 1523-2021 ANSI C29.12-2020 |
Core Rod Performance
Physical Properties
Dye penetration test duration ≥15min | Side Barcol Hardness: 65~75 HBa | Water absorption ≤0.05%
Mechanical Properties
Tensile strength ≥1100MPa | Flexural strength ≥900MPa | In-plane shear strength ≥35MPa
Electrical Properties
Leakage current ＜50μA after water diffusion test
Withstand 80% dry power-frequency flashover voltage for 30min, temperature rise ≤5K (no breakdown & flashover)
AC breakdown strength ≥30kV/cm | Positive DC breakdown strength ≥+50kV/cm (10mm specimen)
Positive dry lightning impulse withstand voltage ≥+100kV (10mm specimen) | Volume resistivity ≥1.0×10¹⁰ Ω·m (140°C)
Stress-Corrosion & Thermal Performance
Withstand 67% SML for 96 hours under 1N nitric acid exposure
Thermal induced test (150°C / 4h): No exudation, no cracking, no discoloration
Hot flexural strength (150°C): 280MPa ~ 350MPa
Swing Fatigue Resistance
No cracking or whitening after 1.2×10⁵ cycles of fatigue test
Core Competitive Advantages
Our manufacturing factory in Lishui is equipped with advanced pultrusion production lines to independently produce core rods of various diameters. Full-process control from raw material inspection to pultrusion forming guarantees excellent mechanical strength, electrical performance and precise dimensional tolerance.
Click the link below to explore our manufacturing facilities on site via the 360° digital panoramic workshop.
Core Rod Specifications & Manufacturing Process
Diameter D6mm ~ D110mm
(Custom sizes available with new mould development)
Superior Mechanical Strength: Manufactured with ECR-glass fiber and modified epoxy resin via vacuum pultrusion technology. Capable of sustaining tensile loads ranging from 10kN up to over 1000kN.
Excellent Brittle Fracture Resistance: Passes stringent acid resistance and water diffusion tests to prevent brittle failure caused by interface water penetration, with service life exceeding 30 years.
Rigorous Standard Compliance: Manufactured in accordance with DL/T 1580 and IEC 62039-2021, featuring compact structure without internal voids.
High-Reliability Internal Insulation: High glass transition temperature (Tg). Nano-scale interface sealing effectively suppresses partial discharge.
Main Application Fields
Widely applied on 10kV ~ 1000kV AC & DC transmission and distribution lines. It serves as the central insulating structural component that provides mechanical performance for composite suspension insulators, tension insulators and station post insulators.
D28-D80mm: Suitable for cross-arm insulators | D28-D110mm: Suitable for station post insulators
