In the world of electrical insulation materials, the Bakelite sheet, also known as phenolic laminated paper sheet, remains one of the most widely used and cost-effective solutions. Its excellent mechanical strength, heat resistance, and electrical insulation performance make it an essential material in electrical, mechanical, and industrial applications.
This article provides a detailed Bakelite sheet application guide, covering its properties, advantages, and selection tips to help engineers, purchasing managers, and manufacturers make the right material choice.
A Bakelite sheet is a phenolic resin bonded laminate made by impregnating layers of cellulose paper with phenolic resin and pressing them under high temperature and pressure. The result is a rigid, durable, and electrically insulating board that performs reliably under various environmental conditions.
Because of its stable dielectric properties and excellent mechanical strength, Bakelite sheet is used as an electrical insulation board in transformers, motors, switchgear, and control panels.
► Excellent Electrical Insulation
Bakelite sheets have high dielectric strength and insulation resistance, making them ideal for low- and medium-voltage electrical equipment. They effectively prevent current leakage and short circuits even in demanding conditions.
► High Mechanical Strength
With a dense and uniform structure, phenolic laminated sheets maintain dimensional stability and resist deformation under load, vibration, or heat.
► Heat and Wear Resistance
Bakelite sheet can operate continuously up to 120–150°C, with short-term endurance at higher temperatures. It also resists friction and abrasion, which is essential for moving mechanical parts.
► Good Machinability
The sheet can be easily cut, drilled, milled, and machined into custom insulation parts without cracking. This flexibility makes it ideal for manufacturing insulating gaskets, spacers, and fixture components.
► Chemical and Oil Resistance
It withstands exposure to transformer oil, lubricants, and industrial chemicals, maintaining long-term stability in electrical systems.
► Electrical and Power Equipment
• Transformer insulation plates and terminal boards
• Motor end covers and commutator supports
• Switchgear panels and control cabinet baseplates
• Electrical insulation barriers and mounting brackets
► Mechanical Engineering
• Insulating spacers and machine support bases
• Jigs, fixtures, and molds requiring dimensional stability
• Bearing plates, wear pads, and anti-friction components
► Electronics and Appliances
• Circuit board backplates and electrical housings
• Heat-resistant insulation for heaters, welders, and soldering machines
► Automotive and New Energy Systems
• Insulation parts for EV motors and controllers
• Battery pack insulation and structural reinforcement boards
• Electrical enclosures and protective shields
These diverse Bakelite sheet applications make it a trusted choice in electrical manufacturing, mechanical design, and industrial equipment assembly.
When choosing a phenolic laminated sheet, several factors determine its performance in a given environment:
1. Temperature Resistance
For continuous high-temperature applications above 150°C, consider upgrading to G10, G11, or epoxy fiberglass laminate sheets.
2. Mechanical Load
Thicker and denser sheets (≥10 mm, density ≥1.4 g/cm³) should be selected for heavy-duty structural parts.
3. Processing Recommendations
• Use sharp carbide tools to avoid edge chipping.
• After machining, remove dust and burrs to maintain insulation quality.
• Keep the material dry before installation to ensure stable dielectric performance.
4. Storage and Maintenance
• Store horizontally in a dry, ventilated place.
• Avoid exposure to moisture, sunlight, or oil contamination.
• Clean regularly to prevent conductive dust accumulation.
5. Why Choose Bakelite Sheet for Industrial Insulation
While modern materials like FR4 and epoxy glass laminates are gaining popularity, Bakelite sheet remains one of the most cost-effective insulation materials for industrial and electrical applications.
It delivers reliable insulation, mechanical strength, and processability at a fraction of the cost — ideal for manufacturers, OEMs, and repair workshops that require stable performance with controlled budgets.
From transformers and motors to control panels and machine components, Bakelite sheet continues to play a vital role in the electrical and mechanical industries. Understanding its properties, processing, and selection criteria helps ensure product reliability and efficiency.
If you are looking for a professional electrical insulation material manufacturer that provides custom Bakelite sheet solutions, precision machining, and export packaging, choose XuJue — your trusted partner in insulation innovation.
