Melanie-

    Is the flux you are using water-based (VOC-free)?  This was an issue for us as alcohol-based fluxes
produced a residue when cleaned with water.

Ryan Jennens
Pheonix Engineering Design

Melanie Racuya wrote:

> Hello netters
>  We're using a with clean solder paste in the manufacturing of our
> flex and I'm encountering  white residues  as seen after aqueous
> cleaning. Can this be an effect of the flux content of the solder
> paste that we are using? Or is it the cleanliness of the DI water
> beign used by the aqueous cleaning machine (which is drained and
> changed every end of the shift)? We tried reloading it in the aqueous
> cleaner but it doesnt suffice cleaning the white residues. Will I be
> needing another chemical or solvent to clean it up first before
> reloading it in the aqueous machine?
> By the way, did anybody among you have encountered this problem
> before?
> I need your help!
>
> Thanks,
> Bing
>
> ################################################################
> TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
> ################################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
> To subscribe:   SUBSCRIBE TechNet <your full name>
> To unsubscribe:   SIGNOFF TechNet
> ################################################################
> Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
> For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
> ################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################