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SMT electronics assembly manufacturing forum.


Solder paste turning dry

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#69623

Solder paste turning dry | 27 June, 2013

I had a solder paste SAC305 T4, with flux loading of 11.5%. After retrieivng out from fridge(5deg) after 48hrs, the paste turn dry (like dry mud? and after double checking the flux loading it becomes 12.5%. Has anyone ever experience this or any opinons on this weird scenario.

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#69792

Solder paste turning dry | 14 July, 2013

So how does one check the flux loading?

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#69795

Solder paste turning dry | 14 July, 2013

1.Weight the paste 2.reflow the paste 3.clean the residue from the reflow ingot 4.weight the ingot

By using simple calculation we can extract the percentage of metal or flux loading from the solder paste.

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