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-31 (Benzyl Alcohol 63% (CAS No: 100-51-6) + Ethyl Lactate 37% (CAS No: 97-64-3)) in removing Oak 529 oil from stainless steel, aluminum, and steel coupons as a potential replacement for TCE with an unheated ultrasonic cleaning method.
Date Run:
12/01/2023
Experiment Procedure:
Nine brass coupons were used for each cleaner 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 soil with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected to unheated ultrasonic in SB-27 and SB-31 for 15 minutes. After the coupons were cleaned, they were left to air dry overnight. The next morning, the clean weights of each coupon were taken.
Trial Results:
Cleaner
Substrate
Initial content weight
Final content weight
Percent content removed
Average percent removed
SB-27
Stainless Steel
0.0262
-0.0067
125.57
106.35
-0.0019
113.87
0.0265
0.0054
79.62
Aluminum
0.0346
0.0004
98.84
93.76
0.0232
-0.0074
131.90
0.019
0.0094
50.53
Steel
0.0106
0.0016
84.91
81.07
0.0134
0.0054
59.70
0.0071
0.0001
98.59
SB-31
Stainless Steel
0.0176
-0.0009
105.11
89.50
0.0226
0.0006
97.35
0.0212
0.0072
66.04
Aluminum
0.0670
0.0451
32.69
-9.28
0.0389
0.0063
83.80
0.0088
0.0215
-144.32
Steel
0.0248
0.0368
-48.39
-41.08
0.0418
0.0289
30.86
0.0298
0.0613
-105.70
Success Rating:
Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
Conclusion:
There was a large amount of variation in how the cleaners and substrates interacted. SB-27 seemed to clean really well, while the coupons cleaned with SB-31 never dried overnight. Further testing would be needed to examine if these cleaners can be a suitable replacement for TCE.
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