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3640 Epoxy Glass Cloth Laminated Tube

3640 Epoxy Glass Cloth Laminated Tube is a seamless B‑grade (130 °C) insulating tube formed by impregnating alkali‑free glass cloth with epoxy‑phenolic resin and curing under heat and pressure, delivering exceptional dielectric strength, mechanical robustness, and low moisture uptake for critical electrical applications.

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Product Details

The 3640 tube is manufactured by hot‑rolling layers of high‑tenacity, alkali‑free E‑glass cloth saturated with a tailored epoxy‑phenolic resin, followed by precision baking and hot pressing to achieve a uniform, void‑free wall structure. Its B‑class insulation rating ensures continuous operation up to 130 °C, while the laminated construction provides high flexural and compressive strengths alongside stable dielectric properties even after prolonged immersion in transformer oil. Finished tubes exhibit a smooth, clean surface with tight thickness tolerances, enabling precise machining into coil insulation cylinders, spacer rods, and other structural components.

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Product Parameters

Standard

IEC61212-3

NEMALI-1

DIN 7735

MIL-I-24768

Flexural Strength (⊥ lamination)

≥ 70 MPa

Axial Compressive Strength

≥ 60 MPa

Breakdown Voltage (∥ lamination in 90 °C oil)

≥ 35 kV

Dielectric Strength (⊥ lamination in 90 °C oil)

≥ 6 kV/mm

Water Absorption (24 h)

≤ 1 %

Product Advantages

Uniform, Void‑Free Walls

Seamless filament winding and hot pressing create a laminate free of internal voids, ensuring consistent mechanical and electrical performance.

Tight Thickness Tolerances

Precision control during rolling and curing delivers tubes that require minimal post‑machining, reducing waste and production time.

Excellent Moisture and Oil Resistance

Maintains insulation integrity after extended exposure to humid environments or transformer oil, guaranteeing long‑term reliability.

Product Applications

Dry‑Type Transformer Coil Supports

Machined into insulation cylinders and end coils for dry‑type transformers, providing stable dielectric barriers between windings.
Radar Assembly Spacers

Used as precision insulator rods in radar transmitters and antenna feed networks, where dimensional stability and low dielectric loss are critical.
Instrument Housings in Petrochemical Controls

Fabricated into solvent‑resistant enclosures and pipelines for control instruments, combining chemical resistance with high‑voltage insulation.

FAQ

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What is the average delivery time?

Delivery times vary based on the quantity and specifications of the order. Typically, delivery can take anywhere from 3 to 30 days. For more precise information, please contact us directly via email or WhatsApp.