To evaluate successful cleaners under ultrasonic energy
Date Run:
08/01/2002
Experiment Procedure:
The eight successful cleaners from the previous trial were again diluted to 5% using DI water in 600 ml beakers and heated to 130 F on a hot plate. Solutions were then degassed for 5 minutes in a Crest 40 kHz ultrasonic tank. Twenty-four preweighed coupons were coated with coated with Jackson Lea Learok 7-S-3 Buffing compound (102-71-6, 14808-60-7, 1317-95-9). The buffing compound was applied by first heating it with a hot air gun and rubbing the coupons with the melted contaminant. Coupons were allowed to cool to room temperature and then weighed again. Three coupons were cleaned in each solution for 5 minutes using ultrasonic energy at 40 kHz. Following the cleaning, coupons were rinsed with a DI water bath for 30 seconds at room temperature and dried using a Master Appliance Heat Gun at 300 F for 15 seconds. Coupons were again allowed to cool to room temperature and then weighed a final time. Cleaning efficiencies were calculated and recorded.
Trial Results:
Only two products, Permag S-4 and Micro 90 removed all of the buffing compound without any additional wiping action. However, it was noted that the buffing compound was again only loosely attached the coupons. When the coupons were wiped with a single pass using a paper towel, the remaining contaminant was removed easily. The following table lists the efficiencies calculated for both the initial Immersion test and the wipe analysis.
Cleaner
Initial wt of cont.
Final wt of cont.
%Cont Removed
Permag S-4
1.0714
0.0007
99.93
1.7478
0.0006
99.97
1.3386
0.0031
99.77
815 GD
1.4520
0.6673
54.04
1.3156
0.7116
45.91
0.8519
0.4219
50.48
Micro 90
1.2660
-0.0006
100.05
1.3342
0.0002
99.99
1.0181
0.0000
100.00
ND 17
1.4717
0.8485
42.35
1.1798
1.2827
-8.72
1.3983
0.9215
34.10
Inproclean 3800
1.1298
0.5082
55.02
2.0867
1.4363
31.17
0.8887
0.1345
84.87
Dirtex
1.2341
0.5514
55.32
1.5249
1.0775
29.34
1.1501
0.6131
46.69
Polychem Spray 790P
1.5179
1.7077
-12.50
2.3515
2.5264
-7.44
1.2234
1.3021
-6.43
Daraclean 282 GF
0.9261
0.3788
59.10
1.3303
0.7860
40.92
0.9001
0.1792
80.09
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Two products were successful in removing the buffing compound with ultrasonics alone. Permag S-4 and Micro 90 will be compared directly under conditions similar to current cleaning setup of 1/2% solution and 1-2 minute cleaning time.
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