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Blog I need your ideas on how to test flux!
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  • Author Author: baldengineer
  • Date Created: 25 May 2022 4:44 PM Date Created
  • Views 6143 views
  • Likes 10 likes
  • Comments 24 comments
  • soldering
  • flux
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I need your ideas on how to test flux!

baldengineer
baldengineer
25 May 2022

Bucket of Flux Paste

I have been thinking about an episode that compares different types of flux. Primarily I want to compare rosen, water-soluble, and no clean.

I need your help with at least two aspects.

First, what to cover. The two key areas I am thinking about are how effective are each and how difficult are they to clean? Are there any other areas we should explore?

Second, how to do the testing. My thought was to sand the finish off some scrap PCBs and expose them to moisture to generate some corrosion. Is there another way to simulate joints that require cleaning? Maybe an additional test needs to be soldering new components/PCBs for comparison?

Ultimately, I can solder parts to those PCBs and then compare the resulting solder joints with a microscope.

I'm open to the community's thoughts on what to test and how. So let me know what you think!

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Top Comments

  • Jan Cumps
    Jan Cumps over 3 years ago in reply to baldengineer +1
    (... and shelf life + storage requirements? For those that don't use a lot of flux it is a thing.)
  • shabaz
    shabaz over 3 years ago in reply to indeterminatus +1
    Regarding: If it makes any difference at all, what about health hazards? Are all fumes somewhat equally bad? It can take decades before health problems appear. Case in point is Parkinsons, where…
  • Jan Cumps
    Jan Cumps over 3 years ago in reply to baldengineer

    No, but it's mentioned on the data sheets.

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  • robogary
    robogary over 3 years ago

    I grade flux by how much billowy smoke it creates  :-)

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  • baldengineer
    baldengineer over 3 years ago in reply to dougw

    Hm. Maybe I could just cover pads in flux, bake it in my reflow oven and then try doing a 4-wire resistance measurement of large pads

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  • baldengineer
    baldengineer over 3 years ago in reply to rsjawale24

    Thanks for the idea. But I purposely do not watch videos on topics I plan to cover.

    This one looks interesting and I might look at it after I'm done, since it looks more comprehensive on comparing actual products than what I want to do.

    One of my goals is to give a more educational look at how to evaluate whatever flux someone already has on-hand.

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  • baldengineer
    baldengineer over 3 years ago in reply to Jan Cumps

    Do you think I could bake flux at an elevated temperature to simulate age?

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