[sdiy] Ultrasonic cleaning solutions

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Thu Sep 28 16:51:43 CEST 2023

What kind of flux?

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------ Original Message ------
From "Andrei Kudryavtsev via Synth-diy" <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
To "Synth DIY" <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
Date 9/28/2023 1:00:32 AM
Subject [sdiy] Ultrasonic cleaning solutions

Hi All,
I have PCBs with SMD and TH parts, and also with plastic connectors. SMD parts are machine soldered, TH components are manually installed. Obviously some flux residue is visible from manual soldering.
I have a 22L ultrasonic cleaner with a temperature control.
The boards are quite large, like 100x250mm or so.
Wondering if you can share some experience using an ultrasonic cleaner to avoid solvent based sprays and mechanical cleaning.
There are some threads of using IPA inside small zip lock bags to avoid evaporation, which seems to work well for small boards and is relatively safe. However it's not my option due to the board size.
I also see some "ultrasonic flux remover" detergents on eBay, but for some reason they are all in the UK.
Also I found the specialized Flux Off by Chemtronics but have never tried it.
Please, suggest.

Andrei Kudryavtsev,

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