Trial #15
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.
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.
| 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
|
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.
No relation