Trial #12
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.
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.
| 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
All three solvent mixtures were effective in removing both soils from stainless steel coupons using unheated immersion.
No relation