To determine the minimum cleaning time at increased concentrations.
Date Run:
09/11/1998
Experiment Procedure:
Eighteen preweighed coupons were contaminated with oil using a hand held swab and then weighed. Two cleaning solutions were made into 15% solutions using DI water in a 600 mL beaker. The solutions were heated to 130 F on a hot plate. The beakers were then placed into a Crest 40 kHz ultrasonic tank model 4Ht 1014-6 also at 130 F. Three coupons were placed in each cleaner for a set cleaning time. These cleaning times were 15, 30 and 60 seconds. Coupons were rinsed in tap water at 120 F for 30 seconds and air dried. Final weights were taken after drying was complete.
Both chemistries had good results for the all cleaning times. Table 1 list the cleaning efficiencies for both cleaners at the 3 cleaning times. Table 1. Cleaning Efficiencies at Various Intervals
AK-6215
Daraclean 282
Time
15
30
60
15
30
60
Coupon 1
87.36
89.57
93.35
92.36
95.22
90.64
Coupon 2
90.27
97.45
79.11
96.52
97.43
96.15
Coupon 3
94.48
97.11
100.80
98.12
96.53
94.33
Ave
90.70
94.71
91.09
95.67
96.39
93.71
Std Dev
3.58
4.45
11
2.97
1.11
2.81
Success Rating:
A follow up test, usually based on company input.
Conclusion:
The increased concentration has allowed the cleaning times to be decreased to under 1 minute. The next testing will be performed using the second oil supplied by the client.
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