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Trial #26

Trial #26

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 lapping compound from stainless steel coupons as a potential replacement of TCE with a heated ultrasonic cleaning method.

2024

33

2

58

58

Coupon

07/22/2024

0.00

Ultrasonics

Tatyanna Moreland Junior

Stainless Steel

Buffing/Polishing Compounds

None

Air dry

Gravimetric

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 overnight, and clean weights of each coupon were taken the following day.

Cleaner Soil Initial weight of cont. Final weight of cont. % Cont Removed Average % Removal
SB-27 American Lapping Compound 0.1143 0.0733 35.87 41
0.1 0.0686 31.4
0.0894 0.0406 54.59
LMKT Lapping Compound 0.0703 0.0011 98.44 96
0.0394 0.0007 98.22
0.0603 0.0042 93.03
SB-32 American Lapping Compound 0.1481 0.1356 8.44 17
0.1210 0.0916 24.30
0.101 0.0809 19.9
LMKT Lapping Compound 0.0623 -0.0002 100.32 99
0.0733 0.0007 99.05
0.122 0.0019 98.44

Both cleaners were effective in cleaning the LMKT Lapping Compound but struggled to remove the American Lapping Compound. Those coupons had thick bands of soil leftover, so the cleaners could potentially be more effective in removing thinner layers of American Lapping Compound.

No relation

Name Class Section
Document Evaluation #0 Evaluation 3
Document Evaluation #1 Evaluation 3
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