Key Role of Wax Powder in Circuit Board Protective Coatings

As the core component of electronic devices, printed circuit boards (PCBs) require protective coatings that ensure electrical safety and environmental resilience. Chemi Tech wax powder enhances coating performance through the following mechanisms:

Improved Humidity/Chemical Resistance

Wax powder forms a dense barrier on coatings, resisting moisture, salt spray, and chemical corrosion. Tests show that adding 1%-2% polyamide wax eliminates pinholes in porous substrates (e.g., cast aluminum heat sinks), preventing circuit oxidation.

Enhanced Electrical Insulation

Paraffin-based wax powders exhibit resistivity up to 10¹³–10¹⁷Ω·m, outperforming most insulating materials. In high-voltage applications (e.g., 400V DC buses), wax powder reduces arcing risks, ensuring operational safety.

Prevention of Thermal Adhesion and Wear

Stacked PCBs may adhere during high-temperature storage. The "ball-axis effect" of wax powder (particle size matching coating thickness) creates micro-protrusions to reduce friction and physical damage. Micronized PTFE wax (0.5% addition) also minimizes wear on metal contacts during plug insertion.

Chemi Tech wax powders are used in 5G base stations and industrial controllers, with customized particle sizes (e.g., 5μm) enabling uniform ultrathin coatings.