To evaluate the effectiveness of SB-27 (t-Butyl Acetate 70% (CAS No: 540-88-5) + Benzyl Alcohol 30% (CAS No: 100-51-6)) in removing different soils from stainless steel coupons with a heated ultrasonic cleaning method as a potential replacement of TCE.
Experiment Procedure:
Three stainless steel coupons were used for each cleaner and soil combination, making a total of fifteen coupons. The initial weights of each coupon were recorded. A thin layer of each contaminant was added to the bottom third of the coupon with a swab, and the dirty weights of each coupon were 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 overnight, and clean weights of each coupon were taken the following day.
Trial Results:
Contaminant
Initial weight of content
Final weight of content
Percent Content Removed
Average Percent Removal
Mobil DTE Light Oil
0.0144
0.0048
66.67
66
0.0127
0.0049
61.42
0.0142
0.0043
69.72
Strawman Cutting Oil
0.0212
0.0046
78.30
74
0.016
0.0048
70
0.0171
0.0042
75.44
Lenox Synthetic Lubricant
0.0062
0.0007
88.71
75
0.0201
0.0052
74.13
0.0135
0.0052
61.48
Maintenance Soil
0.0147
0.0039
73.47
68
0.0178
0.0063
64.61
0.0124
0.0044
64.52
Drawell Thin Oil
0.0173
0.0067
61.27
67
0.0177
0.005
71.75
0.0143
0.0047
67.13
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 cleaner was not able to remove any of the contaminants. The one coupon that had less than 0.01g of soil did well, which could mean that SB-27 can remove extremely thin coatings of soil.
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