3021 Phenolic Paper Bakelite Board

3021 Phenolic Paper Bakelite Board

3021 Electrical Bakelite Board: High-Performance Phenolic Paper Laminate

3021 phenolic paper bakelite board (also classified as phenolic paper laminate) is a rigid, high-density industrial insulation sheet manufactured through a high-temperature pressing process. It is composed of layers of premium electrical grade insulation kraft paper fully impregnated with a heat-curable phenolic resin binder, then cured under intense heat and pressure.

As a foundational rigid insulation material, 3021 bakelite board features an excellent balance of high mechanical structural strength, low water absorption, and stable dielectric performance under dry or oil-immersed conditions. Its outstanding punching, drilling, and routing characteristics make it a standard choice for global electrical switchgear and test fixture manufacturers.

Technical Specifications & Parameters

Chengrui 3021 phenolic paper laminate is produced in strict compliance with IEC 60893 standards (Type PF CP 201), ensuring reliable mechanical dimensions and high chemical uniformity.

• Density: 1.30 g/cm³ - 1.45 g/cm³

• Flexural Strength  ≥ 120 MPa

• Tensile Strength ≥ 100 MPa

• Insulation Resistance ≥ 1.0 x 10^8 Ω (After 24h immersion)

• Breakdown Voltage (In Oil) ≥ 15 kV

• Thermal Classification: Class E Insulation (Up to 120°C continuous)

• Water Absorption  ≤ 1.0% (For thicknesses above 3mm)

Standard Supply Formats

Available Thickness : 0.5mm up to 50mm.

Standard Sheet Dimensions:1020mm x 2040mm, 1220mm x 2440mm.

Key Features of 3021 Electrical Bakelite Board:

- Excellent dielectric strength

- Good machinability

- Light weight

- Heat and wear resistant

- Resists corrosion and chemicals

- Good mechanical strength & dimensional stability

- Low moisture absorption

FAQ

Q1: What is the maximum continuous operating temperature for 3021 bakelite board?

A: 3021 is a Class E insulation material with a maximum continuous thermal limit of 120°C. For applications requiring higher thermal endurance, such as Class F (155°C) or Class H (180°C), we recommend upgrading to glass fiber epoxy sheets like FR4 or 3240.

Q2: What is the structural difference between paper-based (3021) and cloth-based (3025) bakelite?

A: 3021 uses electrical kraft paper, giving it superior dielectric properties and a smoother surface for precise drilling at a lower cost. 3025 uses woven cotton cloth, providing much higher impact toughness and structural fatigue resistance, making it better for mechanical components like gears.

Q3: Does CHRCN offer customized CNC cutting and fabrication?

A: Yes. Aside from supplying standard master sheets, we operate automated CNC machining lines. We can cut, drill, chamfer, and mill custom electrical parts or insulation components accordingly.