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 SB-41 (79% EEP, 7% t-butyl acetate and 14% ethyl lactate) in removing oils from stainless steel coupons as a potential replacement for TCE unheated immersion cleaning method.
Date Run:
08/21/2023
Experiment Procedure:
Three stainless coupons were used for each soil for both cleaners for a total of eighteen coupons. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying the soils 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 SB-41 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
Soil
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
% Overall
SB-22
Expoxidized Soybean Oil
0.6891
0.0467
93.22
91.67
94.14
0.5951
0.0438
92.64
0.5512
0.0599
89.13
Canola Oil
0.4963
0.0195
96.07
96.61
0.5339
0.0156
97.08
0.5099
0.0170
96.67
SB-24
Expoxidized Soybean Oil
0.4415
0.0343
92.23
97.07
97.83
0.7678
0.0027
99.65
0.7930
0.0053
99.33
Canola Oil
0.5132
0.0118
97.70
98.59
0.5436
0.0040
99.26
0.4671
0.0056
98.80
SB-41
Expoxidized Soybean Oil
0.7437
0.0081
98.91
97.36
90.30
0.6580
0.0231
96.49
0.5619
0.0186
96.69
Canola Oil
0.3567
0.0745
79.11
83.24
0.3066
0.0568
81.47
0.5000
0.0544
89.12
Coupons soiled with Canola oil, did not air dry overnight
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
All three solvent mixtures were effective in removing both soils from stainless steel coupons using unheated immersion.
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