Ladies and Gentlemen of TechNet:
The IPC Bare Board Cleanliness Assessment Task Group 5-32C is conducting a
correlation study between different ionic cleanliness test methods used to assess
bare board cleanliness. Details of the proposed study can be found in the October
minutes of this task group from the IPC archives (www.ipc.org). This testing is
being done to examine ionic cleanliness levels between the existing ROSE test methods
and three other methods which are increasing in use for bare board testing.
Fabricators are invited to participate in this study. All data will be held as
confidential and will be presented in a coded format. Each fabricator will be
presented with their own data set. The results of the entire study will be published
as an IPC Technical Report. We are currently limiting the scope of the study to 20
fabricators. First come, first served.
For each participant, I request that a technical contact be given for each
fabrication site and that the test boards chosen conform to the following
requirements. These are chosen to minimize some sources of variability.
1. The samples should be from a single facility, single fab line, single lot of
material, single configuration (no mish mash of different factors).
2. Board size should be no smaller than 4 x 4 and no larger than 8x10.
3. Board should be solder masked (properly cured) and tin-lead coated, epoxy-glass
laminate.
4. Test boards should be from the standard process, no special attention (e.g. 20
passes through a cleaner to look better).
5. Boards to be wrapped in IPA cleaned aluminum foil or sealed Kapak bags for
shipment.
6. All boards sent to CSL. They will be returned and the tests are non-destructive.
7. All data will be coded. Only Wittmer and Pauls will have the code.
We will need a total of 15 test boards. If desired, the boards may be scrap for
reasons of misregistration, cracked copper, etc. It should not be for reasons of bad
mask or mask cure or cleanliness. The 15 boards will be tested as follows:
· 3 samples - Standard ROSE per IPC Test Method 2.3.26.1
· 3 samples - modified ROSE per the proposed IPC Test Method 2.3.25.1
· 3 samples - ion chromatography per Delco Electronics C-7000 method
· 3 samples - ion chromatography per IPC Test Method 2.3.28 (CSL standard)
· 3 samples as reserve, possibly for SIR testing later
The boards should be accompanied by a process history, indicating things like solder
mask used, HASL flux or fusing fluid used, laminate type, etc. We want to know as
much about the history as possible. We understand the proprietary nature of many
fabrication processes. This will be respected.
Please contact me or Jack Crawford at IPC ([log in to unmask] OR 847.509.9700 x 393), if
you wish to participate. Any questions should be directed to me.
Sincerely,
Doug Pauls
Technical Director
Contamination Studies Laboratories
201 East Defenbaugh St.
Kokomo, IN 46902
P: 765-457-8095
F: 765-457-9033
E: [log in to unmask]
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Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
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