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Trial Number 3

Trial Purpose:

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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