To evaluate OSEE as a method for determining cleanliness.
Date Run:
01/31/2002
Experiment Procedure:
Four of the top eight cleaners from previous trial were selected for testing. Each was diluted to 5% using DI water in 600 ml beakers. Water was used as a control. The solutions were heated to 140 F in a Crest 25 kHz ultrasonic tank.
Four, 3 inch pieces of silver tape were cut from the supplied materials. Optically Stimulated Electron Emission (OSEE) readings were recorded to establish a baseline. Then each piece of tape was thinly coated with Richard Apex D644 CPD drawing compound. The contaminant was applied with a hand held swab and then wiped with a second tissue to simulate the amount of contaminant present after the drawing process. A second set of readings were recorded to determine the effect of the drawing compound on the OSEE readings of the silver tape. Next, each piece of tape was cleaned in a solution for two 1 second intervals and rinsed in a ultrasonic tap water bath for 1 second. Parts were dried for 10 second using a heat gun at 500 F. Final OSEE readings were recorded and compared to the dirty and baseline levels to determine cleanliness.
Trial Results:
After establishing a baseline level for the tape, the effect of the drawing compound was found to decrease the OSEE readings substantially. Average baseline level for all pieces was found to be 960 (after adjusting for lower numbers) and the average dirty readings was 191. Cleaning in each solution revealed that the OSEE readings increased, returning near to the initial baseline level. Some readings improved over the initial baseline. This would be due to the pieces of tape being somewhat dirty to begin with. The Beyond 2005 appears to only have cleaned one side of the silver part as shown in the table below. Some of the parts had readings that were not consistent with the majority of the other values for the same piece. All these readings were located at one end of the tape. It was determined that this was were the pieces were held while cleaning, rinsing and drying.
Initial Readings
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
Cleaner
1
1
2
2
3
3
4
4
839
972
801
615
237
983
648
987
990
975
989
841
241
960
721
981
974
980
879
704
251
697
291
986
978
980
990
510
411
986
985
983
Overall Initial Ave
Adj Initial Ave
298
975
387
772.14
960.62
Average
945.5
977
915.25
668
288.2
920.8
607.2
985.25
Dirty Readings
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
Cleaner
1
1
2
2
3
3
4
4
215
134
754
200
211
199
161
165
171
190
194
221
162
151
142
136
172
174
177
190
161
132
140
178
164
191
232
209
171
145
142
130
Overall Dirty Ave
Average
180.75
172.5
339.75
205.5
177
157.5
147.25
153.25
191.06
Clean Readings
Top
Bottom
Top
Bottom
Top
Bottom
Top
Bottom
Cleaner
1
1
2
2
3
3
4
4
958
976
972
187
965
965
964
968
966
960
977
176
976
969
974
969
967
963
969
232
975
972
964
967
611
598
634
180
975
553
969
966
958
692
808
759
Overall Clean Ave
Adj Clean Ave
Average
892.2
838
872.4
194.25
973.5
844.2
968.75
968.5
823.17
962
Adj Ave
962.25
897.75
931.5
916.25
Top Bottom Ave
865.1
533.325
908.85
968.625
Top Bottom Adj Ave
930
562.875
942.5
968.625
Success Rating:
A follow up test, usually based on company input.
Conclusion:
Three products, Oakite Inproclean and Sunshine Makers Crystal Simple Green and Brulin EXP 1400 were successful in removing the drawing compound from the silver tape under the described operating conditions. OSEE was also found to be a practical analytical method for determining cleanliness.
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