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Protection of the component in the double Wave

jmaruska

#20432

Protection of the component in the double Wave | 20 June, 2002

I would like to ask you for help. We use mixed technology and we need to protect SMT components in double Wave. Currently we use the carrier for protection of this component. In this case this procces is not possible to use it due to gap between SMT component and connector. Our idea is to use something like solder mask but we need to wash it off (by hot water - if it is possible). Could you advise us some chemical, please?

Thanks.

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#20440

Protection of the component in the double Wave | 20 June, 2002

You can use a peelable, rather than a water washable, temporary solder mask?

Points are: * Vinyl peelable is preferred over latex, because of lower residues. You should be very concerned about this since you are probably running a low residue process. * Some peelable solder masks are laced w/ammonium hydroxide * Some peelable solder masks attack Immersion Tin. *

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Patrick

#20441

Protection of the component in the double Wave | 20 June, 2002

I would suggest you try the acrypeel 2000 peelable mask from Interflux USA. Try this link for more info http://www.interfluxusa.com/Datasheets/Acrypeel2000.htm Good Luck

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RDR

#20445

Protection of the component in the double Wave | 20 June, 2002

I use TechSpray Wsol 2204-8SQ. This is a water soluble mask that is very thick and works pretty well for this application. Drying time depends on thickness and you should let it dry at least for a little while prior to running through the wave. Earlier experiments showed a QFP-100 reaching a max temp of 120 C using this stuff. If you need more protection use more goop but apply it in stages to help keep the air bubbles down and expolding in the wave.

Russ

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