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About HAL Flux
HAL Flux (Hot Air Leveling Flux) is a specialized chemical agent used in the manufacturing of printed circuit boards (PCBs) to facilitate the Hot Air Leveling process. It is designed to promote the uniform flow and adhesion of solder onto exposed copper surfaces while preventing oxidation and solder defects.
Key Functions and Features
HAL Flux serves several critical roles in industrial electronic assembly:
Solder Wetting: It enhances the "wettability" of metal surfaces, ensuring solder spreads evenly across copper pads.
Oxidation Prevention: According to National Products, it reduces surface tension and prevents the formation of oxide films during the high-temperature leveling process.
Thermal Stability: Most HAL fluxes are thermally stable up to temperatures of 280C to 350C, allowing them to withstand the heat of molten solder without breaking down prematurely.
Defect Reduction: It is specifically formulated to minimize common manufacturing issues such as solder bridges, balls, and dross.
Common Product Variants
Depending on the manufacturer and the specific PCB requirements, HAL Flux is available in several types:
Water-Soluble HAL Flux (e.g., N-1 and N-7): These are neutral or highly activated liquid fluxes designed for easy post-solder cleaning with water.
Halide-Activated Liquid (HAL): These are highly active fluxes, often containing organic solvents like alcohol, which are effective for complex multi-layered boards but require thorough cleaning due to visible residues.
Lead-Free HAL Flux: Specialized versions, such as the DF-600K-LF, are formulated to handle the higher operating temperatures (roughly 20C higher) required for lead-free soldering processes.
Synthetic and Rosin-Based: Some manufacturers like Hiflo offer synthetic-based fluxes to minimize copper leaching from the PCB during high-heat operations.
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