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Trial Number 29

Client Number 153

Project Number 8

Trial Purpose:

To evaluate the effectiveness of SB-31 (t-Butyl Acetate 70% (CAS No: 540-88-5) and a mixture of (79% EEP + 7% Ethyl Lactate (CAS No: 97-64-3) + 14% t-Butyl Acetate 70% (CAS No: 540-88-5)) in removing lapping compound from stainless steel coupons as a potential replacement of TCE with a heated ultrasonic cleaning method.

Date Run:

10/23/2024

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. less than 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 100 °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:

Cleaner Soil Initial weight of content Final weight of content Percent Content Removed Average Percent Removal Average Cleaner Percent
SB-31 Dow Corning High Vacuum Grease 0.0852 0.0044 94.84 94.43 86.63
0.0894 0.006 93.29
0.06 0.0029 95.17
Apiezon Grease Type M 0.0207 0.0074 64.25 78.83
0.0462 0.0083 82.03
0.0306 0.003 90.20
MIXTURE Dow Corning High Vacuum Grease 0.0474 0.0218 54.01 78.87 83.72
0.0686 0.0069 89.94
0.0626 0.0046 92.65
Apiezon Grease Type M 0.0531 0.0056 89.45 88.58
0.0437 0.0055 87.41
0.0476 0.0053 88.87

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

SB-31 was effective for Dow Corning, and the mixture was effective for Apiezon. Another test would need to be done to verify the cleaner's effectiveness for the opposite contaminant.

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