To evaluate the effectiveness of SB-22 (79% Ektapro EEP 14% t-butyl acetate 7% propylene carbonate), SB-24 (92% Ektapro EEP 8% t-butyl acetate) and a mixture of 79% Ektapro EEP 14% ethyl lactate 7% t-butyl acetate in removing two production oils from brass coupons as a potential replacement for TCE unheated immersion cleaning method.
Date Run:
08/10/2023
Experiment Procedure:
Three brass coupons were used for each cleaner and the two soils 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 corresponding soil with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected unheated immersion in SB-22, SB-24, and the mixture with the stir bar at 240rpm for 15 mins. After the coupons were cleaned they were left to air dry over night. The next morning, the clean weights of each coupon were taken.
Trial Results:
Soil
Cleaner
Initial Content Weight
Final Content Weight
Percent Removed
Average Percent Removed
Oak 7a
SB-22
0.0651
0.0018
97.24
96.27
0.0343
0.0017
95.04
0.0462
0.0016
96.54
SB-24
0.0685
0.0019
97.23
94.55
0.0362
0.0022
93.92
0.0293
0.0022
92.49
MIX
0.0657
0.0009
98.63
95.39
0.0344
0.0019
94.48
0.0288
0.0020
93.06
Echocut 44
SB-22
0.0831
0.0004
99.52
96.40
0.0343
0.0020
94.17
0.0400
0.0018
95.50
SB-24
0.0423
0.0017
95.98
96.26
0.0373
0.0016
95.71
0.0585
0.0017
97.09
MIX
0.0712
0.0016
97.75
97.11
0.0513
0.0015
97.08
0.0399
0.0014
96.49
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
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