To evaluate the effectiveness of SB-11 (46% Ektapro EEP 54% Benzyl Benzoate), SB-22 (79% Ektapro EEP 14% t-butyl acetate 7% propylene carbonate), SB-24 (92% Ektapro EEP 8% t-butyl acetate). and SB-32 (81% ethyl lactate 19% propylene carbonate) in removing production oils from brass coupons as a potential replacement for TCE unheated immersion cleaning method.
Date Run:
08/03/2023
Experiment Procedure:
Three brass coupons were used for each cleaner for a total of twelve coupons. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying Mobil Vactra Oil #2 with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected unheated immersion in SB-11, SB-22, SB-24, and SB-32 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:
Cleaner
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
SB-11
0.1465
0.0334
77.20
85.93
0.1719
0.0084
95.11
0.2442
0.0355
85.46
SB-22
0.1282
0.0023
98.21
98.77
0.1368
0.0025
98.17
0.1635
0.0001
99.94
SB-24
0.1493
-0.0092
106.16
103.95
0.2254
-0.0080
103.55
0.2023
-0.0043
102.13
SB-32
0.2024
0.0909
55.09
69.97
0.0848
0.0217
74.41
0.0541
0.0106
80.41
The coupons cleaned with SB-24 had lower clean weights than initial weights, this could be due to the solvent stripping the brass coupons.
The soil separated in SB-22 and SB-32, the soil dissolved in SB-11 and SB-24.
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-11 and SB-22 are effective cleaners in removing production oil from brass coupons using unheated immersion. SB-32 is a somewhat effective cleaner in removing production oil from brass coupons using unheated immersion. SB-24 should not be used on brass due to the potential of stripping the substrate.
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