Halogen-Free PCBs Processing Characteristics

Are you interested in regulations, materials, or environmental impact of halogen-free PCBs?

Principle of Halogen-Free Substrate

• Halogen-free materials are mainly phosphorus-based or phosphorus-nitrogen-based.
• Phosphorus resin decomposes under heat to form meta-polyphosphoric acid, creating a flame-retardant effect.
• Phosphorus and nitrogen compounds in the resin generate incombustible gases, enhancing flame retardancy.

Features of Halogen-Free Sheet

• Improved insulation resistance and breakdown resistance due to reduced polarity of molecular bonds.
• Lower water absorption compared to halogen-based materials, enhancing reliability and stability.
• Higher thermal stability and lower coefficient of thermal expansion.

Producing Halogen-Free PCBs

• Suppliers like Polyclad, Isola, Shengyi, Nanya, Hongren, and Matsushita Electric Works offer halogen-free materials.
• Lamination parameters vary, requiring specific heating rates and pressure fitting for strong bonding.
• Drilling parameters need adjustment for halogen-free boards due to increased rigidity and Tg point.
• Alkali resistance is lower than standard FR-4, requiring monitoring during etching and rework processes.

Experience in Halogen-Free Solder Mask Production

Optimizing rework parameters for halogen-free boards is crucial before batch production to avoid issues like white spots on the substrate.

Types of Halogen-Free Solder Mask Inks

Various types of halogen-free solder mask inks are now widely available worldwide, offering performance on par with traditional liquid photosensitive inks. The application processes for these inks mirror those used for standard inks.

Conclusion

Halogen-free PCBs boast minimal water absorption and comply with environmental regulations while meeting quality standards. As a result, the demand for halogen-free PCBs is increasing, leading major PCB suppliers to invest heavily in researching and developing halogen-free substrates and materials. The industry foresees the availability of cost-effective halogen-free circuit board options in the near future. Therefore, PCB manufacturers are advised to prioritize experimenting with and integrating halogen-free PCBs into their production, formulate comprehensive strategies, and gradually elevate their utilization to meet market demands.

WellCircuits stands out as a premier producer of halogen-free PCBs. For details on WellCircuits’ halogen-free PCB products, visit: Halogen-free PCB.