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Acceptance Criteria Ion Chromatography testing?

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#66430

Acceptance Criteria Ion Chromatography testing? | 22 May, 2012

Are there any established acceptance criteria for contaminants based on Ion Chromatography testing? I've found some references to certain levels for some contaminants but there doesn't seem to be any industry consensus. Any feedback or reference to limits with supporting data would be appreciated.

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#66432

Acceptance Criteria Ion Chromatography testing? | 23 May, 2012

Simple answer is no, there is no universally acknowledged acceptance criteria. Some time ago, I started a spreadsheet with the acceptance levels suggested by various labs on the individual ionic species. All are relatively close in their individual allowables, but there are slight differences. One of the biggest differences are the levels associated with cleaned and no-clean assemblies. Another potential roadblock to an acceptance criteria is IPC's 3 classes of electronics. What is a defect for class 3 can be acceptable for class 1, so manufacturers would most likely require 3 classes for ionic residues as well.

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#66472

Acceptance Criteria Ion Chromatography testing? | 31 May, 2012

J-STD-001E, 8.3.6.2 states 1.56um/cm2 NaCl value.

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#66476

Acceptance Criteria Ion Chromatography testing? | 31 May, 2012

edmaya33, you're correct about what J-STD-001E says, but recognize that the measure that you refer us to in not IC [Ion Chromatography]. It is modified ROSE [Resistivity of Solvent Extract] ... or whatever they call modified ROSE now-a-days

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#66477

Acceptance Criteria Ion Chromatography testing? | 31 May, 2012

rsthompson ... if you're talking about bare boards

IPC-5701, Users Guide for Cleanliness of Unpopulated PBC, Table 8 ||Bare board final surface finish Ions||Hot air solder level||OSP over copper||Gold over nickel Chloride||0.75 ug/cm^2||0.75 ug/cm^2||0.75 ug/cm^2 Bromine||1.0 ug/cm^2||1.0 ug/cm^2||1.0 ug/cm^2 Sodium + Potassium||2.0 ug/cm^2||4.0 ug/cm^2||2.0 ug/cm^2 Calcium+ Magnesium [*]||3.0 ug/cm^2||3.0 ug/cm^2||3.0 ug/cm^2 Total inorganic||3.8 ug/cm^2||5.9 ug/cm^2||3.8 ug/cm^2 [*] After 12/31/98, these ions will be included in the “Total inorganic Category as 3.8 ug/cm^2

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