Water-soluble solder paste is a flux-containing paste that is designed to be completely removed using deionized water after the reflow process. This type of paste is ideal for applications requiring ultra-clean assemblies, especially in high-reliability electronics manufacturing.

Unlike no-clean pastes, which leave minimal non-corrosive residues, water-soluble solder pastes leave active flux residues that must be cleaned after reflow. This ensures a residue-free surface, which is critical in sensitive or high-performance electronic assemblies.

Water-soluble pastes are favored in industries where ionic contamination, corrosion risk, or cleanliness verification are concerns. They provide superior wetting and solderability, and the residues are easily removed in inline or batch cleaning systems using only water.

Key benefits include excellent solder joint reliability, strong wetting on difficult surfaces, and total residue removal. This results in cleaner assemblies, improved insulation resistance, and compliance with strict quality or regulatory requirements.

Industries such as aerospace, military, medical, telecommunications, and automotive electronics use water-soluble solder paste where high-reliability, post-soldering cleanliness, and long-term performance are essential.

The flux residue is removed using deionized water in a cleaning process, typically with spray-in-air, spray-under-immersion, or ultrasonic cleaning systems. No chemical additives are required, and proper cleaning ensures zero ionic contamination.

Yes. Water-soluble solder pastes should be stored refrigerated (typically between 0–10°C) and brought to room temperature before use. Proper handling prevents moisture absorption and maintains print and reflow performance.

Yes. Water-soluble solder pastes are available in lead-free formulations such as SAC305 and other RoHS-compliant alloys. INVENTEC Performance Chemicals offers water-soluble pastes tailored for lead-free and high-performance soldering requirements.

Consider your cleaning equipment, water quality, board sensitivity, and inspection protocols. It's also important to ensure proper drying after cleaning. INVENTEC’s technical team can assist in evaluating compatibility and process optimization.

Yes. INVENTEC Performance Chemicals provides advanced water-soluble solder pastes with excellent printability, wetting, and easy residue removal. These solutions support high-reliability applications across diverse industrial sectors.