Trial Number 1

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 Atofina Copperskin 510 metal working compound (CAS#s: 64742-52-5, 123-95-5, 8016-28-2, 8002-13-9) . 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 DI 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.

The average OSEE readings measured for the each initial set was found to be 914. The average dirty reading was found to be 410. Comparing the final readings for each of the cleaners revealed that only one cleaner was completely successful in removing the oil, Oakite Inproclean 3800. Three others had readings in the 700 and one had a reading just above the average dirty reading. The following table lists the readings for each cleaner.

The Oakite product was the only one to work under these conditions.  The three products with OSEE readings in the 700's (BCS, Sunshine Makers and Today & Beyond) would probably work with an additional 2 seconds of cleaning.  The six pieces have been sent back for further analysis.