Product advantages
The core advantage of bakelite comes from the molecular structure of phenolic resin (three-dimensional network cross-linking), which enables it to remain stable under extreme working conditions, as shown in the following:
1. Extreme heat resistance
Long-term use temperature: 120~180℃ (ordinary type); glass fiber reinforced type can reach 200~250℃;
Heat deformation temperature (1.8MPa load): 120~150℃ (ordinary type), significantly higher than most engineering plastics.
2. Excellent electrical insulation
Dielectric constant (1kHz): 4.5~7.0 (low loss);
Breakdown voltage: ≥15kV/mm (applicable to high voltage scenarios);
Complies with UL94 V-0 flame retardant standard (self-extinguishing when away from fire), and is the "insulation benchmark" in the field of electronics and electrical engineering.
3. Chemical corrosion resistance
Resistant to weak acids/alkalis, salt solutions, and organic solvents;
Only not resistant to strong oxidizing acids such as concentrated nitric acid and aqua regia (long-term contact will slowly corrode).
4. High mechanical strength and wear resistance
Rockwell hardness (HRM): 80~100;
Tensile strength: 50~100MPa (glass fiber reinforced type can reach more than 150MPa);
Wear resistance: friction coefficient 0.2~0.3 (suitable for sliding parts).
5. Processing convenience and cost advantage
Low density;
Can be cut, drilled, and polished without special equipment;
Low raw material cost.
Application
The "high insulation + high temperature resistance" characteristics of bakelite make it a core material for electronic and electrical and mechanical manufacturing. The specific applications are as follows:
1. Electronic and electrical fields
Insulating parts: motor stator/rotor slot wedges, transformer skeletons, relay bases, high-voltage insulators;
Switches and connectors: power socket panels, circuit breaker contact brackets, connector housings (arc resistance);
Electronic component packaging: resistor/capacitor bases, diode heat dissipation substrates (need to be combined with metal sheets for heat conduction).
2. Mechanical manufacturing fields
Wear-resistant parts: bearing cages, guide rail sliders, gears (replacing metal to reduce weight, resistant to lubricating oil);
Corrosion-resistant parts: chemical equipment pipeline flanges, electroplating tanks (resistant to weak acids/alkalis);
Structural parts: instrument brackets, fixtures, molds (heat-resistant + easy to process).
Usage and precautions
1. Processing and usage
Cutting: It is recommended to use tungsten carbide saw blades or bakelite-specific milling cutters;
Drilling: Speed 800~1500rpm, feed rate 0.1~0.3mm/r (avoid overheating of the drill bit and carbonization of the material);
Polishing: Use sandpaper (800~2000 mesh) for manual or mechanical polishing, and the surface can be coated with varnish to enhance the gloss;
Assembly: When connecting with metal parts, it is recommended to use epoxy resin glue (to avoid loose bolts, as bakelite is rigid and prone to stress cracking).
2. Precautions
Avoid high-temperature organic solvents: long-term contact with acetone, benzene, etc. will swell the surface (short-term contact has no effect);
Anti-corrosion with strong acids and alkalis: avoid long-term contact with concentrated sulfuric acid and concentrated sodium hydroxide (can be used in weak acid and alkali environments);
Dust protection: phenolic dust is generated during processing, and a mask must be worn (long-term inhalation may irritate the respiratory tract);
Storage conditions: Store in a sealed, dry and ventilated place, away from direct sunlight (to prevent resin aging).
