Electrical Insulation Board: The Complete Guide for Power Equipment Manufacturers
Why Electrical Insulation Matters
In every electrical machine -- from a tiny DC motor to a 500 MW power transformer -- insulation is the technology that makes high voltages safe and practical. Insulation boards are the flat, machinable sheet materials that provide electrical isolation between conductors, structural support, and thermal management in power equipment.
Types of Electrical Insulation Boards
1. Epoxy Fiberglass (FR4 / G10 / 3240)
The most versatile insulation board family. Woven glass fiber fabric provides mechanical strength; epoxy resin provides electrical insulation and flame retardancy.
- FR4: UL94 V-0, PCB standard, 130-180 degrees C Tg
- G10: Non-flame-retardant, maximum strength, industrial use
- 3240: Chinese GB standard, high arc resistance (greater than 180s), industrial insulation
2. Phenolic Resin Board (Bakelite / PF)
Paper or cotton fabric base with phenolic resin. Lower cost than epoxy fiberglass, good electrical properties, self-extinguishing flame behavior.
- PF1 / PF2: Paper base, general electrical use, medium voltage
- PF3: Cotton fabric base, mechanical applications, higher impact resistance
3. PET Film Board (PETP / PET)
Polyethylene terephthalate (PET) film, known for excellent dimensional stability, low water absorption, and good mechanical properties at an economical price point.
4. Nomex / Aramid Paper
Meta-aramid fiber paper famous for exceptional thermal stability (continuous rating to 200 degrees C) and inherent flame resistance without additives.
Key Parameters for Insulation Board Selection
| Parameter | What It Tells You |
|---|---|
| Dielectric Strength (MV/m) | Breakdown voltage per mm -- higher is better for high-voltage |
| Arc Resistance (seconds) | How long before an arc tracking forms -- critical for switchgear |
| Flexural Strength (MPa) | Mechanical load-bearing capacity |
| Water Absorption (%) | Dimensional stability in humid environments |
| Glass Transition Tg (degrees C) | Temperature above which material softens |
Application Guide
- Transformer winding barriers: FR4, 3240, Nomex
- Switchgear insulation: FR4, 3240, Phenolic
- Motor slot insulation: Nomex paper, PET, Phenolic
- PCB substrates: FR4 only
- High-temperature applications: Nomex, High-Tg FR4
- Cost-sensitive applications: Phenolic, PET
Dongguan Chaorong Electronics -- Insulation Board Supplier
We supply and precision-machine electrical insulation boards for power equipment manufacturers:
- Materials: FR4, G10, 3240, Phenolic (PF), PET -- all grades in stock
- Thickness: 0.3-50mm, any custom size
- CNC Processing: Cutting, drilling, milling, tapping, custom shapes
- Standards: UL, RoHS, REACH, GB certified materials
- MOQ: 1 piece for custom machined parts
Contact: dggbsr.com | No. 2 Desheng West 1st Street, Gaobu Town, Dongguan, Guangdong, China
Conclusion
Electrical insulation boards are the unsung heroes of power equipment. Selecting the right material requires balancing dielectric properties, mechanical strength, thermal performance, cost, and applicable standards. With the right insulation board, you can design safer, more reliable, and more efficient electrical equipment.