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Coils and Water Soluble Fluxes

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Coils and Water Soluble Fluxes | 10 October, 2007

Coilcraft has posted the following and I am wondering how you folks are handling the use of coils in a Water Soluble world.

PCB Washing and Coilcraft Parts Coilcraft tests for resistance to solvents per the following specification:

Resistance to solvents

Specification There must be no change in appearance or obliteration of marking.

Test method/condition

Inductors must withstand 6 minutes of alcohol.

Many of our customers use water-based cleaning systems without reporting problems. Because of the large number of variables in cleaning operations (solvent type, pressure, number of cycles, etc.), Coilcraft does not perform tests using cleaning systems.

Water based solvents may include neutralizers, surfactants, saponifiers, dispersants and anti-foaming agents, so Coilcraft cannot recommend a solvent (other than pure water and/or alcohol).

Coilcraft cautions against the use of water-soluble (organic) fluxes with any of our components. Weak organic acid (WOA) residues cannot be completely removed from the windings of fine-wire components. Water-soluble fluxes cause immediate or latent corrosion of the wire. The residues from organic fluxes are hygroscopic and contain acids that may contain halides. The combination of moisture and halides creates a corrosive (acid) solution that flows between windings and will cause damage to the component.

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Coils and Water Soluble Fluxes | 11 October, 2007

We'd probably hand solder these coils with low residue fluxed wire solder, after cleaning.

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