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  • Author Author: Jan Cumps
  • Date Created: 8 Feb 2019 12:41 PM Date Created
  • Views 4152 views
  • Likes 11 likes
  • Comments 15 comments
  • flux
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Trying Out the Rossmann Flux

Jan Cumps
Jan Cumps
8 Feb 2019

One of the things that jump out in Louis Rossmann's videos is the type of flux he uses (and the amount image).

The fluxes I have at home are liquid, and that works well when building new PCBs. The Amtech flux I'm testing here is a jelly when applied and becomes fluid when hot. This may be helpful when reworking surface mount ICs, where my flux is gone by the time I'm halfway reworking them.

image

 

What I'm hoping to get out of this is to improve my success rate when reworking QFN packages and the likes.

I'm not the fastest guy on earth when dealing with these types of components.

 

What's included?

 

The flux is AMTECH's NC-559-V2-TF. It comes in a syringe. A plunger and dispense needle are optional.

There's 10 ml in the container. That should be plenty for me. I expect that the shelf life of one year will expire before I've consumed all.

I got one from a fresh batch. It's manufactured in the same month that I placed my order.

 

Although the label says that it's a lead-free soldering material (technically correct, because there's no lead in the flux), it's not compatible with leaded solder.

There is a lead-free variant (VS-213-A-TF).

 

The flux isn't corrosive and can be left on the board, but the manufacturer advises against that.

It makes the board more prone to contamination. It can result in increased voltage leakage for sensitive designs and can become a moisture trap.

 

I'll try it out soon and report back on the experience.

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Top Comments

  • Jan Cumps
    Jan Cumps over 6 years ago in reply to jw0752 +4
    It’s almost as baldengineer ’s experience with ChipQuick’s flux. The only thing it doesn’t do is form a bubble and boil. It forms a fluid film that stays in place. I just retried reflowing a TQFN package…
  • neilk
    neilk over 6 years ago in reply to Jan Cumps +3
    I'm still using the same spool of leaded solder I bought over 20 years ago. This shows 2 things: How inactive I was until I joined this forum That I mostly software - hardware (ie soldering) only when…
  • Jan Cumps
    Jan Cumps over 6 years ago in reply to neilk +3
    This is what's left from the last one I bought when at school (must be a roll from 85 or early 86): I switched to lead free, not for the environment as primary reason, but because it's a required skill…
  • pseakins
    pseakins over 3 years ago in reply to Jan Cumps

    OK. So, if you edit your post I will delete my comment and this.

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

    it's a typo. It should say unleaded.

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  • pseakins
    pseakins over 3 years ago

    You're saying that "it's not compatible with leaded solder". I am pretty sure that is incorrect as Louis always replaces the unleaded solder on the repairs with leaded solder before cleaning the joints. Unleaded solder is a big bone of contention with him as it causes lots of unnecessary equipment failures.

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  • baldengineer
    baldengineer over 6 years ago in reply to neilk
    I'm still using the same spool of leaded solder I bought over 20 years ago.

     

    I recently replaced my 25-year-old spool. Not because it was running low, but because it had become so tangled it was troublesome to use.

     

    Now I have a spool of Leaded and Lead-Free. So I should be good for at least the next 50 years. image

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  • neilk
    neilk over 6 years ago in reply to Jan Cumps

    Understood - I've been retired a very long time now image

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