Electronics > Manufacturing & Assembly

Good lead free solder for hand soldering

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lfldp:

--- Quote from: wraper on February 26, 2022, 11:18:21 am ---I don't like Stannol at all. They use some crappy fluxes which either produce some dark residues and burned junk on a solder tip, and/or splatter a lot. First of all you should look on what alloy is used. SnCu alloys flow much worse  than SAC305, SAC307 and SN100C and it's clones like K100LD (unless used with active fluxes). SN100 probably produces the nicest solder joints and flows very well. SAC307 is the cheapest of what I mentioned. Regarding the quality of flux, and which is priced reasonably, I like solder produced by Alpha.

--- End quote ---
hi i agree lead-free solder wires should contain agressive flux to keept valid temperature do you think this one will be ok ? https://www.tme.eu/pl/en/details/hf850sac305-075_05/solder-wires-lead-free/alpha/sac305-telecore-hf-850-122-0-75mm-500g/
thanks

Monkeh:
I've been using a bit of Weller wire solder in SN99.3/CU0.6/NI0.05 for some work recently and been quite happy with it. It looks like they might have discontinued the alloy, though? CPC still have some stock including little sample packs. Very aggressive flux. It is also nearly £20 for a 100g roll, though.

lfldp:

--- Quote from: Monkeh on June 10, 2023, 07:13:36 pm ---I've been using a bit of Weller wire solder in SN99.3/CU0.6/NI0.05 for some work recently and been quite happy with it. It looks like they might have discontinued the alloy, though? CPC still have some stock including little sample packs. Very aggressive flux. It is also nearly £20 for a 100g roll, though.

--- End quote ---
not available in my country :(

lfldp:
funny thing i did some tests last night and i dont see completly any difference in soldering quality for beetwen cheap and expensiff solder wires:
1. stannol SN100C - with nicel and german SnCu0,7NiGe - expensiff price few times higher than cynel brand !
2. cynel professional sn99,3Cu0,7 - cheap one
both of them loose flux very quickly on under the fume hood and im getting thin whiskers also flow of this tin seems is same
so ?

tooki:

--- Quote from: lfldp on June 11, 2023, 07:25:15 am --- and im getting thin whiskers also flow of this tin seems is same
so ?

--- End quote ---
No you’re not. Tin whiskers take years to grow, in the rare cases they do. (Normally from pure tin plating, not from solder.)

Anyhow, Stannol isn’t cheap, but honestly I don’t particularly like it. I like Kester for leaded, and Felder “SN100Ni+” (SnCuNiGe).

It’s all about the flux, and IMHO Stannol just isn’t that great in that regard.

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