Reflow Oven Standard oxygen content

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Good morning. What should be the Oxygen content Standard i... - Jun 10, 2021 by Edgar A.

I am not aware of a "standard" I can tell you fro... - Jun 10, 2021 by Sr. Tech

Hi Edgar, I am not aware of any standards either, but from ... - Jun 16, 2021 by MagyarT

Edgar A.

#86747

Reflow Oven Standard oxygen content | 10 June, 2021

Good morning.

What should be the Oxygen content Standard in an Oven?

Here in my company, we have an ERSA reflow Oven, and we work with Lead Free solder paste. According to Work Standard documents send by my company corporate, the PPM Oxygen content should be the next one:

Oxygen content standard: ≤ 1000PPM Alert setting of oxygen content: Set value: 500ppm, tolerance value: ±400ppm

I'm learning about this machine and process. But I'll like to understand why this values. I'll appreciate any comments regarding this.

If this is for any help, we work with server boards, so they're big and have a lot of BGA's

Thanks.

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Sr. Tech

#86748

Reflow Oven Standard oxygen content | 10 June, 2021

I am not aware of a "standard" I can tell you from experience that at < 1000 PPM performs the same as 100 PPM.

Usually if a customer requires Nitrogen they will set the spec.

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MagyarT

#86762

Reflow Oven Standard oxygen content | 16 June, 2021

Hi Edgar,

I am not aware of any standards either, but from own experience can tell that if there are boards going through oven with PPM between 1500-2000 the solder will be dark (unaesthetic) although some of our customers accepted them if they were tested good. Over 2000 ppm the PCBAs will get (slightly) discoloured - it's not something that we would like, isn't it?

We had the same settings on Rehm ovens, but never questioned this internal standard, as it always worked.

Cheers, Tom

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