Determine relationship between efficiency and OSEE
Date Run:
04/06/1998
Experiment Procedure:
Initial measurements of six coupons were made for OSEE and gravimetric analysis. The coupons were contaminated with the sulfur based oil supplied by the client. A second set of readings were made for the analytical methods. Coupons were cleaned using the two different baths (new and one week) of M-Auto from Church & Dwight. Cleaning took place in beakers place in a 40 kHz Crest Ultrasonic Unit for five minutes at 130 F. Coupons were rinsed in tap water at 120 F for thirty seconds and dried using air blow off and an Original Disc Furnace portable heater model 1500IV for one minute. After coupons cooled to room temperature, the final OSEE and gravimetric readings were made.
Gravimetric analysis revealed the cleaning efficiencies to be 98% for the new bath and 87% for the used bath. OSEE readings are listed in Table 1. Table 1. OSEE Readings of Coupons
Table 1. OSEE Readings of Coupons
New
Coupon #
Pre
Dirty
Clean
7
116
62
141
8
102
62
233
9
139
87
160
Used
Coupon #
Pre
Dirty
Clean
10
104
85
117
11
181
96
132
12
128
85
127
When the coupons were contaminated with the oil, OSEE readings went down. After cleaning the values went back up again. The clean OSEE numbers from the New bath were higher than the Used bath. Also, the clean readings for both cleaners were greater than the initial values. This indicates that the coupons may not have been completely clean before the experiment was started.
Success Rating:
A follow up test, usually based on company input.
Conclusion:
Gravimetric analysis was used to link OSEE readings to cleanliness levels. As can be seen in this trial, the more contaminant present on the substrate, the lower the OSEE numbers will be.
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