For SMT under around 100ppm gives sometimes gives great results, but haven't seen the less than the 500 ppm grive radical improvement in wave solder because of the turbulence of the wave and activity of the flux... Paul Paul Edwards Surface Art Engineering -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D. Sent: Saturday, October 16, 2010 6:02 AM To: [log in to unmask] Subject: Re: [TN] Detecting Oxidation Levels of PTH Oxygen levels should be less than 75 ppm, else don't bother. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall Sent: Friday, October 15, 2010 7:45 AM To: [log in to unmask] Subject: Re: [TN] Detecting Oxidation Levels of PTH Joyce, We have nitrogen in the reflow ovens with max O2 levels of 500 ppm. Our facility humidity is controlled and within a range of 35 to 45%. We also have nitrogen pumping at the wave bath. Leland -----Original Message----- From: Joyce Koo [mailto:[log in to unmask]] Sent: Friday, October 15, 2010 8:37 AM To: [log in to unmask]; Leland Woodall Subject: Re: [TN] Detecting Oxidation Levels of PTH Not nitrogen reflow prior to wave? How many times SMT before wave? What is the humidity contorl on the floor? -------------------------- Sent using BlackBerry ----- Original Message ----- From: Leland Woodall [mailto:[log in to unmask]] Sent: Friday, October 15, 2010 08:32 AM To: [log in to unmask] <[log in to unmask]> Subject: Re: [TN] Detecting Oxidation Levels of PTH OSP over copper, lead-free, SAC 305 process. -----Original Message----- From: Tan Geok Ang [mailto:[log in to unmask]] Sent: Thursday, October 14, 2010 8:23 PM To: TechNet E-Mail Forum; Leland Woodall Subject: RE: [TN] Detecting Oxidation Levels of PTH ImAg Boards? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Leland Woodall Sent: Friday, 15 October 2010 3:49 AM To: [log in to unmask] Subject: [TN] Detecting Oxidation Levels of PTH Techies, We have one assembly that sporadically experiences insufficient solder fill of plated through holes at the wave soldering process. If we cross section one of these, what testing equipment is best suited to detect the presence of oxidation on the PTH walls? What would be considered an unacceptable level that would prevent 100% climb? Thanks in advance for your responses! Leland ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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