Aquanox® A4625 is a versatile aqueous cleaning chemistry designed to clean the latest lead-free residues while providing brilliant mirrored solder finishes. Easy to use, Aquanox A4625 is environmentally friendly, has a long tank life and is safe for multi-pass applications.
Aquanox A4625 is a highly dispersive cleaning agent engineered to remove lead-free no-clean flux residues. Aquanox A4625 is formulated with high dispersive, moderate polarity, and moderate hydrogen bonding forces. Aquanox A4625 is effective on greater than 90% of the solder pastes in production today. A4625 is commonly used to clean rosin and no-clean flux residue types but will also clean water soluble soils.
Aquanox A4625 solvency make-up is engineered with a mixture of oxygenated alcohol-ether compounds, which are partially soluble in water. The solvents were selected on their ability to dissolve rosin and resin structures. The solvents provide a unique hydrophobic (rosin/resin loving) and hydrophilic (water loving) balance. The operating concentration range for water soluble soils is 5-10%, 10-15% for rosin-based soils, and 13-18% for no-clean soils.
The concentrated Aquanox A4625 contains no water or inorganic salts. The high level of solvency within the A4625 concentrate provides high dispersive values at the dilution concentration ranges. The solvent micro-droplets at operating wash temperatures ranging from 130-155°F provide high affinity for non-polar resin and rosin structures.
Aquanox A4625 contains low levels of a polar organic reactive solvent with one side of the molecule inducing the ion-dipole on non-polar resins and the other portion of the molecule providing dispersive forces. These unique properties provide affinity for both ionic and non-ionic solutes. Functional additives are added to reduce interactions on metallic alloys, anodized aluminum, and conversion coatings. The pH ranges from 9.5-10.5 dependent on the in use concentration.
Aquanox A4625 is designed for use in spray-in-air cleaning equipment. The operating concentration varies with the soil type. A4625 is a low foam cleaning agent that is commonly monitored based on the solvent / water ratio. Wash time is a function of the soil, component geometry and Z-axis gap. Lower Z-axis gaps under components typically require longer wash times.