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Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 7th Feb 2019, 3:47 pm   #1
Julesomega
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Default Liquid Rosin Flux

I have said it before: the use of liquid rosin flux for successful soldering and re-soldering is not widely recognised, and I had not encountered it until I started work in manufacturing industry. If you feel you cannot improve on your soldering with your favourite brand of rosin-cored solder read no further, but if you have ever been frustrated trying to tin a stripped wire or trying to solder to the nickel-plated terminals of a Phono-socket or Jack-plug, treat yourself to a small bottle of Liquid Rosin Flux and a "Needle Bottle".

I have just bought a needle bottle and it far exceeds the performance of any other flux bottle I used at work. These do not leak and cannot be spilled but allow the precise administration of minute quantities of the sticky stuff. Search eBay for >Needle Bottle for Rosin Solder Flux< where you will find two sizes, 50 and 30ml. I bought the 50ml but 30 would be more convenient on the workbench. Search also for a small quantity of the flux, and for some IPA (Isopropanol) for cleaning off flux residue. I apply liquid flux to any and every solder joint.

I normally set my iron to 260-300C for normal-fine work. I now use these needle bottles for the IPA and for white spirit
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Last edited by Julesomega; 7th Feb 2019 at 4:04 pm. Reason: PS
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Old 7th Feb 2019, 5:29 pm   #2
mickm3for
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Default Re: Liquid Rosin Flux

Hi i make my own liquid flux using rosin from music shop desolved in ipa
100gram rosin to 1ltr or so ipa works well
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Old 7th Feb 2019, 6:04 pm   #3
kalee20
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Default Re: Liquid Rosin Flux

I used to use violin rosin years ago! However, as it is intended for applying to bows, its efficacy as a flux, freedom from corrosive residues, etc is unassessed and likely to be a bit variable from batch to batch.

The general spirit of this thread, though, agree completely! Liquid rosin fluxes are sold in various broad categories, R (Rosin); RMA (rosin, mildly activated) and RA (rosin, activated) according to how aggressive the flux has to be.

Great for surface mount, too!
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Old 7th Feb 2019, 7:22 pm   #4
kellys_eye
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Default Re: Liquid Rosin Flux

I started using liquid flux a couple of years ago after watching hot air reworking videos on SM components. Not looked back since. I was initially concerned at how freely some users 'poured' it around but that can often make the difference between the soldering job working easily or being a bit more difficult.

A bottle of IPA to clean up afterwards is also recommended.
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Old 8th Feb 2019, 12:39 am   #5
Julesomega
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Default Re: Liquid Rosin Flux

Re the grades of rosin flux, I'm not sure what I'm using, most likely RMA. It was being thrown out of Stores 25 years ago for exceeding the use by date, I can only read "Ersin Multicore Rosin Flux Type 5381 1L" so I have several lifetime's supply. We later used a pale blue water-based flux which left no residue and was slightly more 'activated'. This was brilliant and if I had to buy flux now I'd look for something similar - but beware, most are corrosive and for plumbing or soldering steel or stainless. The clue seems to be to look for rosin-free, halide-free, Lead Free
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Old 12th Feb 2019, 2:22 pm   #6
Steve G4WCS
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Default Re: Liquid Rosin Flux

I find a flux pen very useful for PCB rework and SMT work

https://www.pcb-soldering.co.uk/sra-...SABEgJ7DfD_BwE
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Old 12th Feb 2019, 3:36 pm   #7
ionburn
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Default Re: Liquid Rosin Flux

I have just got into surface mount assembly (using standard soldering iron and solder soldering technique), and have found the liquid flux indispensible. It is not practical to use standard solder with an iron directly, having to use tweezers to hold the components (hence needing three hands), but I was amazed how easy things go with a prior application of flux.
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Old 29th Mar 2019, 2:40 pm   #8
defender
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Default Re: Liquid Rosin Flux

I just bought several lifetimes supply of flux from the auction site, just need a few needle bottles.
I'll take some to work, give some to my mate then I've got 3/4 of a litre at home.
1 Litre MG Chemicals 835-1L Liquid Rosin Flux
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