Thank you very much for your valuable suggestion! We will solve it as soon as possible!

Solder Paste

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Solder paste is a material used in the manufacture of printed circuit boards to connect surface mount components to pads on the board. It is also possible to solder through hole pin in paste components by print solder paste in/over the holes.

Community > Groups > Solder Paste > Solder Paste Flux
Solder Paste Flux
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jeorge daniel

I'm using Kester R520A Lead free solder paste. The flux % stated on the Certificate of Analysis(COA) when the product delivered to us is 10 %. The tolerance is 1%. But when i send the jar to an external lab to determine the flux % it is more than 11%, whereby it should not be more than 10.5%. According to Kester, the figure stated in the COA is the amount mix with the solder powder. Moreover, there will be chemical reaction between the activators in the flux & Tin (Sn) which will results in increase amount of flux. The increase is called a correction factor which we need to add up to the number in COA. The correction factor range from 0.5 to 0.8%. Does anyone have any idea about this? By the way, I am trying to reduced the flux% in order to reduced the solder splattering. Will this work?
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It help me a lot. Thank you.


Very valuable!


I was really confused, and this answered all my qutoiesns.


Like this post very much.

Biagio Carlucci

Marvelous posting.

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