Epoxy glass fiber winding tube is made of fiberglass yarns impregnated with an insulating colloidal compound of epoxy resin and other resins, and is formed by hot-baking by wet-rolling. This product has a high temperature resistance class and reaches class H, with good electrical properties, mechanical properties, low dielectric consumption, no deformation, no delamination, chemical resistance (resistant to SF6) and etc. It is widely used in the main insulation of H-type dry-type transformers, on-load tap-changers, reactors, arresters, SF6 transformers and other products.
Glassfiber Reinforced Epoxy Filament Wound Tube
Decoiling ,Moulding, Welding, Punching, Cutting
F grade (155℃ ), H grade ( 180℃) , 220℃
F, H
Epoxy resin + Glass Filament
Yellow, Green, Red
4-1000mm
≤3000mm
0.5-30mm or customized
H Class heat resistance (180 °C) with stable electrical performance
UL94 V-0 flame retardant
Excellent electrical insulation, low dielectric loss, stable in dry and wet conditions
Low water absorption and good moisture resistance
High mechanical strength with good dimensional stability
Smooth surface & good machinability, suitable for drilling, cutting, and CNC processing
● Power transformers: Oil-immersed transformers and H-class dry-type transformers.
● High-voltage electrical equipment: On-load tap changers, reactors, lightning arresters, and SF₆ transformers.
● Insulation components: Arrester sleeves, fuse tubes, spacers, bushings, and coil forms.
● Electrical and structural applications: High-voltage insulators, antennas, and equipment supports.
● Industrial and pipeline systems: Chemical, petroleum, water, and wastewater treatment piping components.
● General industrial use: Bearings, collars, pressure tubing, structural tubing, and tool handles.
| GRE FW - Glassfiber Reinforced Epoxy Filament Wound Tube | ||||
|---|---|---|---|---|
| Physical Properties | Condition | Standard | Unit | Value |
| Density | — | IEC 60893 | g/cm³ | ≥ 2.0 |
| Water Absorption Rate | — | IEC 60893 | % | ≤ 0.02 |
| Mechanical Properties | Direction | Standard | Unit | Value |
| Tensile Strength | Ring | IEC 60893 | MPa | ≥ 900 |
| Tensile Strength | Axial | IEC 60893 | MPa | ≥ 55 |
| Compressive Strength | Longitudinal | IEC 60893 | MPa | ≥ 150 |
| Bending Strength | — | IEC 60893 | MPa | ≥ 320 |
| Compressive Strength | ⟂ to bending | IEC 60893 | MPa | ≥ 120 |
| Shear Strength | — | IEC 60893 | MPa | ≥ 700 |
| Bending Modulus of Elasticity | Vertical | IEC 60893 | MPa | ≥ 1.6 × 10⁴ |
| Electrical Properties | Condition | Standard | Unit | Value |
| Axial Impact Withstand Voltage | 5 times | IEC 60243 | kV/mm | 7 |
| Radial Power Frequency Withstand Voltage | 50 Hz, 1 min | IEC 60243 | kV/mm | 8 |
| Surface Breakdown Voltage | Wet air, 30 mm, 1 min | IEC 60243 | kV | ≥ 15 |
| Breakdown Strength (Vertical Layer) | Oil, 90 ± 2°C, δ ≤ 3 mm | IEC 60243 | MV/m | ≥ 18 |
| Volume Resistivity | Normal | IEC 60093 | Ω·m | ≥ 6.0 × 10¹² |
| Surface Resistivity | — | IEC 60093 | Ω | ≥ 9.5 × 10¹⁴ |
| Relative Dielectric Constant | 50 Hz | IEC 60250 | — | 5.59 |
| Dielectric Loss Factor | 50 Hz | IEC 60250 | — | ≤ 0.02 |
| Partial Discharge | 35 kV | IEC 60270 | pC | ≤ 5 |
| Thermal Properties | Condition | Standard | Unit | Value |
| Thermal Class | Insulation class | IEC 61109 | — | H Class |
Yes, based on drawings or samples.
UL, RoHS, REACH, CE, ISO, etc.
Usually 100 kg or 100 sheets, negotiable.
Yes, common samples free, buyer pays freight.
2-4 weeks after payment.
Yes, including labeling and packaging.
Yes, over 20 years.
T/T 30% deposit, 70% before shipment. Negotiable if supports needed.
Yes, we offer CNC machining.
Manufacturer and Exporter
No.3, Mianzhi Street, Zhucheng, Shandong, China
Copyright © 2025 by Qingdao Yilong Insulation Material Company Limited All Rights Reserved
