I usually use rosin flux for soldering or one with rosin core if the solder refuses to stick. I recently found this Goot BS-15 flux, but it says not applicable to PC boards. The label says hobby use soldering paste.

Unfortunately, the contents everything on the back of the container is in Japanese so I can't know for sure what this is intended to use for.

So,has anyone here come across this type of soldering flux and know what this might be used for?

Front side

Rear side

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    \$\begingroup\$ hapoin.com/en/flux/bs-10-15-850.htm Soldering paste for cables and large size terminals. BS-10/ 15 cannot be used on PCBs. \$\endgroup\$ – John D Nov 17 '17 at 17:27
  • \$\begingroup\$ its an acid flux used for large connectors and cables vaseline 80-90% with zinc chloride and ammonium chloride as active ingredients. \$\endgroup\$ – JIm Dearden Nov 17 '17 at 17:28
  • \$\begingroup\$ @JohnD Thanks for the link. So, can this be used to solder those ring current terminals for high current battery terminals ? \$\endgroup\$ – The_Vintage_Collector Nov 17 '17 at 17:29
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    \$\begingroup\$ Yes, that's within the intended application of this flux, but personally I would still use a non inorganic acid flux. If you do use it make sure to clean it thoroughly afterward. \$\endgroup\$ – John D Nov 17 '17 at 17:36

The clue is it says 'weak acid'. This is an acid-based flux, for soldering 'big stuff', cables onto terminals, and it should be suitable for plumbing as well. Clean the joint after soldering.

For PCBs, you should use a rosin-based flux. Most people use a cored solder, without using a separate flux.


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