High-Temperature & Acid-Resistant FRP Core Rod
As a world-leading supplier of composite insulator components, we possess a comprehensive in-house production line for core rods. We offer core rod products that comply with power industry standards (DL/T) and mechanical industry standards (JB/T), including DL/T 1580-2021 "Technical specifications of core for AC and DC composite insulators" and JB/T 10944—2010 "Glass fiber reinforced pultruded profiles for electrical insulation - Core rods for composite insulators".
Meanwhile, our core rods fully meet the standard acceptance requirements for relevant composite insulators both domestically and internationally.
| GB (China National Standard) | IEC | ANSI/IEEE |
| 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 time ≥15min | Barcol hardness 65HBa~75HBa | Water absorption ≤0.05%
Mechanical Properties
Tensile strength ≥1100MPa | Flexural strength ≥900MPa | In-plane shear strength ≥35MPa
Electrical Properties
Leakage current after water diffusion test <50uA
Temperature rise ≤5K after 30min at 80% dry power-frequency flashover voltage (no breakdown/flashover)
AC breakdown strength ≥30kV/cm | Positive DC breakdown strength ≥+50kV/cm (10mm)
Positive dry lightning impulse withstand voltage ≥+100kV (10mm) | Volume resistivity ≥1.0X10¹⁰·m (at 140°C)
Stress Corrosion & Thermal Resistance
Withstand 67% SML for 96h under 1N Nitric Acid
Thermal induced performance (150°C/4h): No exudation, no cracks, no discoloration
Hot flexural strength (150°C): 280MPa~350MPa
Swing Fatigue Characteristics
No cracking or surface whitening after 12X10⁵ swing fatigue test cycles
Core Competitiveness
Our factory in Lishui City features an advanced pultrusion production line capable of independently manufacturing core rods of various specifications. Total process management—from raw material control to pultrusion molding—ensures exceptionally high mechanical strength, electrical performance, and dimensional accuracy.
Click the link below to experience our manufacturing strength and production site firsthand through our 360° panoramic digital workshop.
Core Rod Specifications & Craftsmanship
D6mm ~ D110mm
(Customization for non-standard sizes via new mold opening is supported)
Excellent Mechanical Strength: Manufactured using high-performance ECR-glass (boron-free acid-resistant glass fiber) and modified epoxy resin via an advanced vacuum pultrusion process. Capable of withstanding axial tensile loads from 10kN to over 1000kN.
Superior Anti-brittle Fracture: Tested under strict acid corrosion and water diffusion conditions to prevent "brittle fracture" caused by interface water seepage. Designed service life exceeds 30 years.
Strict Compliance: Production and inspection strictly follow DL/T 1580 and IEC 62039-2021 standards, ensuring a dense internal structure without pores, cracks, or impurities.
Reliable Internal Insulation: High glass transition temperature (Tg) and excellent dielectric loss control. Nano-scale sealed connections effectively suppress partial discharge, ensuring electrical reliability under high and ultra-high voltage.
Primary Applications
Widely utilized in AC and DC transmission and distribution lines from 10kV to 1000kV. It serves as the central insulating component for composite suspension, tension, and post insulators, providing essential mechanical characteristics.
D28-D80mm: Suitable for Cross-arm Insulators | D28-D110mm: Suitable for Station Post Insulators
