To evaluate the effectiveness of SB-27 (t-Butyl Acetate 70% (CAS No: 540-88-5) + Benzyl Alcohol 30% (CAS No: 100-51-6)) and SB-32 (Ethyl Lactate 81% (CAS No: 97-64-3) + Propylene Carbonate 19% (CAS No: 108-32-7)) in removing greases from stainless steel coupons as a potential replacement of TCE with a heated ultrasonic cleaning method.
Date Run:
07/24/2024
Experiment Procedure:
Three stainless steel coupons were used for each cleaner and soil combination, making a total of twelve coupons. The initial weights of each coupon were recorded. Around 0.1 g of each contaminant was added to the bottom third of the coupon with a swab, and the dirty weights of each coupon were then recorded. The coupons were then subjected to heated ultrasonics in the cleaner for 15 minutes at a temperature of 120 °F. After the coupons were cleaned, they were left to air dry over night, and clean weights of each coupon were taken the following day.
Trial Results:
Cleaner
Soil
Initial weight of cont.
Final weight of cont.
% Content Removed
Average % Removal
SB-27
DAW 330B
0.0761
0.0664
12.75
-21.63
0.0420
0.0550
-30.95
0.0863
0.1266
-46.70
Slide Gel No. 7
0.0523
0.0106
79.73
62.48
0.0407
0.0102
74.94
0.0476
0.0320
32.77
SB-32
DAW 330B
0.0188
0.0007
96.28
91.95
0.0254
0.0027
89.37
0.0286
0.0028
90.21
Slide Gel No. 7
0.0409
0.0087
78.73
83.02
0.0355
0.0066
81.41
0.0334
0.0037
88.92
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Overall, the cleaners were not effective in removing the contaminants, but the only one that worked well enough was SB-32 on DAW 330B. When taking the coupons out of the cleaner, thick clumps of soil clung together and slipped right off the coupons. For the coupons in SB-27, the soil clung together the same way, but it was still attached to the coupon when I took them out, and they even seemed to absorb some of the cleaner and make the averages negative.
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