Laminates, Boards & Films
3240 Epoxy Fiberglass Cloth Sheet
Yellow epoxy glass-cloth laminate, Class F, for transformer and motor structures
3240 is an alkali-free E-glass cloth impregnated with epoxy resin and processed under heat and pressure. It offers high mechanical strength in normal temperature and stable electrical performance under high humidity.
Class F (155°C)0.5–150 mmFlexural ≥340 MPa
- Temperature class
- Class F (155°C)
- Thickness
- 0.5–150 mm
- Density
- 1.9–2.2 g/cm³
- Colour
- Yellow
Request a quotation or a sample. Tell us thickness, width, temperature class, quantity and delivery form. We reply within one business day.
Technical data
| Property | Unit | Value |
|---|---|---|
| Material | — | Alkali-free E-glass cloth + epoxy resin |
| Normal thickness | mm | 0.5–150 |
| Density | g/cm³ | 1.9–2.2 |
| Vertical bending strength | MPa | ≥340 |
| Vertical compression strength | MPa | ≥350 |
| Bending elastic modulus | MPa | ≥24000 |
| Parallel shear strength | MPa | ≥30 |
| Tensile strength | MPa | ≥300 |
| Adhesive strength (10 mm) | N | ≥580 |
| Impact strength parallel to laminations (Charpy) | kJ/m² | ≥35 |
| Dielectric constant (1 MHz) | — | ≤0.04 |
| Parallel breakdown voltage (90 ±2°C oil) | kV | ≥35 |
| Comparative creepage tracking index (CTI) | — | ≥200 |
| T1 long-term thermostability | — | ≥130 |
| Temperature class | — | Class F (155°C) |
Values are typical values or ranges from our product data. Bulk supply is subject to the approved specification, sample and test report. If a parameter you need is not listed here, ask our engineers for the full test report for that grade.
Key features
- Epoxy/glass cloth construction balances mechanical strength and electrical insulation.
- Thickness 0.5–150 mm; can be cut, drilled and milled.
- For transformer yokes, clamps, end insulation and motor structures.
Applications
Structural insulation in oil-immersed and dry-type transformers, motor insulation boards, reactors and switchgear.
Oil-Immersed TransformersDry-Type TransformersElectric Motors & GeneratorsSwitchgear & Electrical EquipmentReactors
Why it fits
The default structural laminate: stable in transformer oil and humid conditions, and easy to machine in-house.
Ordering information
To receive a quotation, please confirm:
- Product and grade
- Thickness and width (and roll or sheet size)
- Temperature class
- Quantity and delivery form (roll / sheet / die-cut / machined)
- Destination port and required delivery date
For machined parts, attach a drawing in PDF, DWG or STEP format. Datasheets, COAs and batch test data are available on request.
Related materials
Often specified together
Send your specification
Our export team reviews the application, the process and the existing specification before recommending a construction.