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Recovery of Expired Solder Paste !!! + Squeegee Lifetime

Hany A. Salam

#20717

Recovery of Expired Solder Paste !!! + Squeegee Lifetime | 16 July, 2002

Hello there:

1- I know someone who diluted expired solder paste, which obviously lost its tackiness using Isopropanol. The paste was expired by more than 6monthes but after dilution I saw by myself the paste has retrieved its tackiness. The amazing result of solder joints I saw under the microscope made me ask you if there is a standard for doing this. I have scrapped a lot of paste before and I hoped there could be a way to avoid loosing all that money.

2- On what basis should I replace the metal squeegee blade? We have a DEK 248, which ran more than 100K of prints without changing the squeegee blade, is it the time to be replaced? What are the criteria?

Thanks everyone. Hany

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#20726

Recovery of Expired Solder Paste !!! + Squeegee Lifetime | 16 July, 2002

Reworking used paste. We do not rework or reuse used paste, because we have no experience reformulating paste or controlling the process.

Squeegee life. We do not use squeegees with damaged blades. After that, if we can fixture them and get good prints, it's a good squeegee. Proof in the pudding thing, yanp?

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