I wouldn't say exactly the same but it's certainly the closest I've found so far.
So ordered Saturday afternoon and it turned up this morning - well packed so a thumbs up for good and prompt service.
Initial impressions are it's very similar to B.O.G. flux in that it's blue! Although a slightly different blue - I would say more aqua blue rather than a cerulean blue of the B.O.G. The other difference is the smell - not technical in anyway but it is different. Not sure how to describe the B.O.G. flux but after consulting with my offspring the verdict was that the Pearsons flux smells just like those solid blue disinfectant blocks they put in the gents urinals!
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in use - I tried tinning my sample sheets used earlier - the Pearsons Safety flux used in the sample circled in red.
This was on the brass sheet - very oxidised no cleaning.
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and the nickel-silver sheet.
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Again wetting and flow seemed on a par with B.O.G. and WL1.
A couple of test joints, an overlap and a 90deg join.
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Actually it flowed really nicely - the resultant solder joint was nice and smooth, the bead of solder in the corner of the joint was nice and tight if you know what I mean, also not too much spatter. The 90deg join it was soldered on the right hand side but it's not that clear on the photo but on the lefthand side it is possible to make out that the solder penetrated all through the join. So pretty good result as far as I'm concerned.
A couple of other points - I'm not sure whether to describe it as viscosity or surface tension but again very similar to the B.O.G. flux. As shown in the first photo I decant the flux into a little dropper bottle to apply just a drop or two from the needle to the joint. With B.O.G. and Pearsons then the flux stays as a bead drop - much like a rain drop on a freshly waxed and polished car - whereas the WL1 flux seemed to have a much lower surface tension so that when you tried to place a drop or two it immediately flattened out and washed over the entire joint - like a rain drop on a car that hasn't been polished for a month or so. The one other small difference noted so far is that with the B.O.G. flux I found some of the ingredients tends to settle out of suspension and the bottle needed a good shake prior to use - now it might be because it's been in transit or that the flux is fresher but there were no such issues with the Pearsons flux.
So there is the caveat that I need to use it few days and also see if there is any corrosion on the joints just test but overall the Pearson Safety Flux is not exactly the same as the B.O.G. flux but it's the nearest equivalent I've found so far. In some ways it slightly edges it so far as it doesn't appear to get a sediment. It is better than the WL1 flux in that it isn't plastered in hazard marking symbols and certainly the fumes were a lot less offensive.
From my very limited testing so far I think if you have been using B.O.G. flux then this is the best equivalent and appears to be equally effective and useable and one I think I will be recommending. So many thanks for the link
@ScottW a brilliant find.
p.s. forgot to say total charge for 200ml incl p&p was £10.16 so it's not going to break the bank!