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Mixing different manufacturers solder pastes

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#63033

Mixing different manufacturers solder pastes | 1 November, 2010

I have a question regarding mixing different manufacturers solder pastes. We have a board being built by a CM that we are bringing in house and soldering a final cover onto the PCB. The contract manufacturer is using solder paste A. We want to use solder paste B from a different manufacturer to solder the cover on.

This is a no clean application. First off, is this legal to do per J-Std? and if it is what risks would we introduce by doing this?

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JAX

#63034

Mixing different manufacturers solder pastes | 1 November, 2010

Who Cares... Mix Away!

Although you should not mix different Solder Pastes' together in a container or on a stencil (Mostly due to the flux, although solder sphere size and shape could cause an issue), mixing solder brands or chemistries on a board is fine... as long as you perform the proper steps prior to the addition of each type. (ex. Wash after Water Soluble - Prior to using No-Clean)

Many companies use: Water Soluble Paste from Maufacturer # 1 No Clean Paste from Manufacturer # 2 Solid Wire from Manufacturer # 3 Cored Wire from Manufacturer # 4

You pick what works best regardless of manufacturer.

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#63036

Mixing different manufacturers solder pastes | 2 November, 2010

Yes, we use solder paste,solder bar and solder wire from different manufactureres for 1PCB assembly. And, what JAX said, we never mixed solder paste from different manufactures and used.

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#63038

Mixing different manufacturers solder pastes | 2 November, 2010

Will the flux residue from solder paste A come into contact with flux from solder paste B? If so you better do some tests. There is always a possibility of a bad reaction between 2 fluxes. You need to test to make sure.

Jerry

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