3640 epoxy phenolic laminated glass cloth tube is manufactured from non-alkali glass cloth impregnated with epoxy phenolic resin, and processed through hot rolling and baking to form a solid, roll-pressed laminated structure. It offers a well-balanced combination of mechanical strength, heat resistance, and dielectric performance. The material is suitable for use as insulating structural components in electrical equipment and can operate reliably in humid environments as well as in transformer oil. Due to its stable overall performance and mature manufacturing process, 3640 tube is one of the most widely produced and commonly used laminated insulation tubes.
YILONG
Epoxy Resin + Phenolic Resin + Fiberglass
1.5-1.7 g/cm³
2-200mm
6-1200mm
1000mm-1200mm
130℃
Pallet, Wooden Box
High mechanical strength and good structural rigidity
Excellent dielectric properties and electrical insulation performance
Reliable performance under humid or wet environmental conditions
Good heat resistance suitable for continuous electrical applications
Compatible with transformer oil
Stable quality and wide application range
● Insulating structural components in electrical equipment
● Mechanical support and insulation parts for transformers
● Electrical insulation components operating in transformer oil
● Insulating parts for motors, generators, and switchgear
● Electrical equipment used in humid or wet environments
● General-purpose insulation components requiring balanced mechanical and electrical performance
| 3640 Epoxy Phenolic Glass Tube | |||||
| No | Testing Item | Unit | Value | TEST METHOD | |
| 1 | Density | g/cm3 | ≥1.4 | GB/T 5132 | |
| 2 | Bending strength ⊥ | MPa | ≥160 | JB/T 3172 | |
| 3 | Compressive strength | MPa | ≥60 | GB/T 5132 | |
| 4 | Shear strength | MPa | ≥12 | JB/T 8150 | |
| 5 | Dielectric loss factor (50Hz) | - | ≤0.03 | JB/T 3172 | |
| 6 | Volume resistivity: normal condition | Ω·m | ≥1.0×1010 | GB/T 10064 | |
| Volume resistivity: After soaking | Ω·m | ≥1.0×108 | |||
| 7 | Insulation resistance Parallel layer: normal | Ω·m | ≥1.0×104 | GB/T 10064 | |
| Insulation resistance Parallel layer: After soaking | Ω·m | ≥1.0×101 | |||
| 8 | Vertical layer withstand voltage | Inner dia＜25mm | Inner dia ≥25mm | JB/T 3172 | |
| Wall thickness： | |||||
| 1.5mm | kV | 7 | 12 | ||
| 2.0mm | 10 | 14 | |||
| 2.5mm | 13 | 16 | |||
| 3.0mm | 15 | 18 | |||
| 9 | Breakdown Voltage ∥ to Laminations (in oil at 90°C) | kV | 25 | GB/T 5132 | |
| 10 | Surface withstand voltage | kV | 12 | GB/T 5132 | |
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
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