Silk screen. TiO2 white color filler. 
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----- Original Message -----
From: Amol Kane [mailto:[log in to unmask]]
Sent: Thursday, June 13, 2013 10:03 AM
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] Titanium

Dear Technetters,
We are seeing some titanium residues (confirmed by EDX) on solder joints after wave soldering post wash (that is not to say they are not present post wave, more analysis is ongoing). Water soluble process, high lead alloy, and a saponified wash. So far the Ti residues are only detectable on the solder joints, not on the assy surface. For general information. what are some possible sources of Ti on the assembly?

Regards,
Amol



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