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Author Topic: Flux core or rosin core solder?  (Read 3137 times)
WX2S
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« on: March 14, 2013, 12:27:19 PM »

I've used rosin-core solder for decades, and in fact just ordered a pound of Kester 63/37. The next day, I discovered that Kester also makes "flux-core" solder. Would I have been better with the flux core?

73,
- WX2S.
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73, - Steve WX2S.
I subscribe to the DX Code of Conduct. http://dx-code.org/
N3QE
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« Reply #1 on: March 14, 2013, 12:39:40 PM »

I've used rosin-core solder for decades, and in fact just ordered a pound of Kester 63/37. The next day, I discovered that Kester also makes "flux-core" solder. Would I have been better with the flux core?

I think in this context, "rosin" is interchangeable with "flux".

Flux dissolves oxides on the metal surface and/or prevents oxidation of the hot metal surface. Rosin is a type of flux. A different flux type is in "acid core solder" but you will not run across that for electrical connections. Or at least I hope you don't!
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WX2S
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« Reply #2 on: March 14, 2013, 12:40:58 PM »

I think the "flux core" stuff uses water-soluble flux as the core.

73,
- WX2S
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73, - Steve WX2S.
I subscribe to the DX Code of Conduct. http://dx-code.org/
N3QE
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« Reply #3 on: March 14, 2013, 01:54:45 PM »

I think the "flux core" stuff uses water-soluble flux as the core.

The stuff you cited is Kester 245 and is solder with "No-Clean flux". No-Clean is in fact far more difficult to clean than the "water soluble".

Solder with water soluble flux is "Kester 331" or "Kester 2331".

Solder with good old fashioned active rosin flux is "Kester 44".

I would not hesitate to recommend Kester 44 for all-purpose use.
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KD0REQ
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« Reply #4 on: March 14, 2013, 02:05:07 PM »

Kester also makes industrial solders with acid flux, usually zinc chloride.

very double-plus-ungood for electronics, does the old ultraviolence on them.

do read the fine print
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