Overview
Bakelite products are thermosetting phenol-formaldehyde resin items, first developed in the early 20th century. They represent one of the earliest synthetic plastics and remain valuable for industrial applications due to their unique combination of electrical insulation, heat resistance, and mechanical durability. These products are typically compression-molded into various shapes and forms, ranging from simple knobs and handles to complex electrical components. The cross-linked molecular structure of Bakelite makes it infusible and insoluble, distinguishing it from thermoplastic materials.
Physical and Chemical Properties
Bakelite exhibits excellent dimensional stability with low thermal expansion, maintaining its shape even at elevated temperatures up to about 150-170°C. Its dielectric strength typically ranges from 10-16 kV/mm, making it particularly valuable for electrical applications. The material demonstrates good resistance to acids and organic solvents, though prolonged exposure to strong alkalis may cause degradation. Its mechanical properties include high compressive strength (about 120-200 MPa) but relatively lower impact resistance compared to some modern plastics.
Main Applications
Electrical industry applications dominate Bakelite usage, including switchgear components, circuit breaker housings, and terminal blocks. Its ability to resist arcing and tracking makes it ideal for high-voltage applications. Automotive applications include distributor caps, ignition components, and various under-hood parts. Industrial uses encompass gears, bearings, and machinery parts where heat resistance and dimensional stability are critical. Bakelite's classic appearance also finds niche applications in vintage-style consumer products.
Safety and Storage
While generally stable, Bakelite products should be stored in dry conditions to prevent moisture absorption, which can slightly affect electrical properties. Dust generated during machining operations should be controlled through proper ventilation. At temperatures above 300°C, Bakelite may decompose, releasing phenol and formaldehyde vapors. Appropriate personal protective equipment (gloves, goggles) should be used when machining or handling rough Bakelite surfaces to prevent irritation from dust particles.
B2B Procurement Guide
When sourcing Bakelite products, specify the required grade - general purpose (GP), electrical (E), or impact-resistant (I) formulations. Key parameters to define include dielectric strength, heat deflection temperature, and mechanical load requirements. Consider the manufacturing method (compression vs. injection molding) as it affects product consistency and cost. Lead times for custom-molded Bakelite parts typically range from 4-8 weeks. For electrical applications, request test certificates for dielectric properties and tracking resistance.
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