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Trial Number 6

Trial Purpose:

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.
SUBSTRATE MATERIAL: Stainless Steel Coupons
CONTAMINANTS: C-Eblis oil (sulfur based)

Trial Results:

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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