Your choice of Galden material determents the type of solder paste alloy that you can use.
If you are using Galden®LS200, the boiling point is 200°C and therefore the only alloys that you can use are the one with a melting point lower then 200°C. This would be the leaded alloys (SnPb)with a melting point between 183 and 188°C depending on the mix rate.
Using Galden®LS230 gives you the opportunity to use any alloy with a melting point lower then 230°C. This would be the leaded alloys (SnPb) and the tin copper silver alloys (SAC) with a melting point from 217°C.
Remark 1: The lead free alloy tin copper (SnCu) has a melting point from 227°C. Theoretically you should be able to solder this paste using a Galden®LS230 but in practice we see that the 230°C is too low to make quality solder connections. We advise to use Galden®LS240 with a boiling point of 240°C if you are using Tin copper alloys in you production.
Remark 2: Check the alloy from pre tinned components especially from BGA’s. It is possible that the alloy is tin copper (melting point 227°C) and therefore the component must be soldered using Galden®LS240 for getting quality solder joints.
The following link will show you a couple of solder pastes available.
Contact your local paste supplier for more information concerning solder paste suitable for vapor phase soldering
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Exmore, Experts in Mounting and Repair, is an independently owned company headquartered in Belgium. As the industry provider in precision different processing solutions, you'll be sure to find us active throughout the world.