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Trial Number 0

Trial Purpose:

To evaluate cleanliness using OSEE of a series of parts that have been cleaned with different processes.

Date Run:

05/05/2003

Experiment Procedure:

Thirteen supplied parts were analyzed using a Photo Emission Tech. Inc Surface Quality Monitor SQM 100. Five readings were made on one side from each of the 13 parts submitted for analysis.

OSEE: Optically Stimulated Electron Emission or PEE, Photo Electron Emission is based on the principle that metals and certain surfaces emit electrons upon illumination with ultraviolet (UV) light. These electrons can be collected, measured as current, converted to a voltage and digitally displayed. A surface contaminant will enhance or attenuate this signal, depending on it own photoemissive nature. While OSEE will not identify a contaminant, it is a good comparative tool to determine the degree of contamination. This method is best suited for thin films (oils, etc.) and not particulate matter (dust, for example).

Trial Results:

Standard cleaning with Oakite Inproclean 1300 at 5% with ultrasonics and two rinse baths at 8 feet per minute rate.
Non standard cleaning with Oakite Inproclean 1300 at 5% with ultrasonics and two rinse baths at 4 fpm rate.

Part # Group

1 Standard cleaning
2 Standard cleaning + isopropyl wipe
3 Standard cleaning + Reno 12 applied (dirty)
4 Standard cleaning + C510 applied (dirty)
5 Standard cleaning + electroclean
6 Standard cleaning + acid etch
7 Standard cleaning + K2SO4 applied (dirty)
8 Nonstandard cleaning
9 Electroclean
11 As drawn, no cleaning (dirty)

5A, 6A & 9A same as 5, 6 & 9 with the addition of vacuum process.

Part # Reading 1 Reading 2 Reading 3 Reading 4 Reading 5 Average Std Dev
1 794 846 673 676 482 694 126
2 1004 1002 1003 1006 1000 1003 2
3 122 128 141 131 115 127 9
4 97 112 102 104 107 104 5
5 991 1000 1001 1003 1002 999 4
6 779 359 710 852 1001 740 214
7 142 144 120 137 115 132 12
8 1000 1000 619 522 729 774 196
9 116 146 133 425 253 215 116
11 98 87 80 88 95 90 6
5A 980 987 989 984 984 985 3
6A 984 983 986 982 987 984 2
9A 985 993 991 987 985 988 3

Method 2 was found to have the highest average OSEE reading (1003), followed by method 5 (999).  The three processes subjected to the vacuum after cleaning resulted in nearly the same readings (5A-985, 6A-984 and 9A-988).

Success Rating:

A cleanliness study, addressing only various analytical techniques.

Conclusion:

OSEE was shown to be an effective analysis method in comparing the various cleanliness of the 13 supplied parts.

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