To evaluate the effectiveness of SB-24 (92% Ektapro EEP, 8% t-butyl acetate), SB-32 (81% Ethyl Lactate, 19% Propylene Carbonate) and SB-41 (79% Ektapro EEP, 14%,ethyl lactate, 7% t-butyl acetate) in removing two production oils from stainless steel coupons as a potential replacement for TCE with an unheated ultrasonics cleaning method.
Date Run:
10/13/2023
Experiment Procedure:
Three stainless steel coupons were used for each cleaner and the two soils being tested, for a total of 18 coupons. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying the corresponding soil with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected to unheated ultrasonics in SB-24, SB-32, and the mixture for 15 minutes. After the coupons were cleaned, they were left to air dry over night. The next morning, the clean weights of each coupon were taken.
Trial Results:
Soil
Cleaner
Initial Content Weight
Final Content Weight
Percent Content Removed
Average Percent Removed
CD Aero A
SB-24
0.0674
0.0053
92.14
90.22
0.0388
0.0041
89.43
0.0403
0.0044
89.08
SB-32
0.0813
0.0037
95.45
85.65
0.0454
0.0155
65.86
0.0391
0.0017
95.65
SB-41
0.0483
0.0012
97.52
96.30
0.0324
0.0023
92.90
0.0657
0.0010
98.48
CD Aero C
SB-24
0.0202
0.0023
88.61
91.36
0.0303
0.0026
91.42
0.0202
0.0012
94.06
SB-32
0.0210
-0.0014
106.67
106.74
0.0208
-0.0024
111.54
0.0444
-0.0009
102.03
SB-41
0.0506
0.0003
99.41
99.97
0.0329
-0.0006
101.82
0.0076
0.0001
98.69
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
The cleaners seemed to be effective at removing the soil but when left to air dry, the coupons that were cleaned in SB-32 and the mixture did not dry completely.
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