To evaluate the chemical mixture SB-29 (54% Benzyl Alcohol, 30% Ethyl Lactate, 16% Propylene Carbonate) effectiveness at removing different oils from stainless steel coupons.
Date Run:
09/10/2025
Experiment Procedure:
Three stainless steel coupons were used for each of the four contaminants (J90, L.S. Starret Mobil DTE24, Milform F0411-A, and L.S. Starret Hocut 795) being tested, for a total of 12 coupons per cleaner. The initial weights of each coupon were recorded. The bottom third of every coupon was soiled by applying the contaminant with a swab. The dirty weights of each coupon were then recorded. The coupons were then subjected to unheated immersion in the cleaners for 10 minutes. After the coupons were cleaned, they were left to air-dry for a week, and then the clean weights of each coupon were taken.
Trial Results:
Soil:
Initial wt of cont.
Final wt of cont.
%Cont Removed
Average % Removal
J90
0.0658
0.007
89.36
89.80
0.0567
-0.0002
100.35
0.0891
0.0181
79.69
L.S. Starret Mobil DTE24
0.0346
0.0192
44.51
29.69
0.0374
0.0285
23.80
0.0424
0.0336
20.75
Milform F0411-A
0.0257
-0.0007
102.72
94.68
0.0351
-0.0027
107.69
0.0254
0.0067
73.62
L.S. Starret Hocut 795
0.0394
-0.0004
101.02
102.33
0.0294
-0.0002
100.68
0.0208
-0.0011
105.29
Success Rating:
Preliminary compatibility tests on substrate coupons encouraging for at least one cleaning chemistry. More in-depth laboratory testing necessary.
Conclusion:
The cleaner was effective at removing J90, Milform F0411-A and L.S. Starret Hocut 795; it seemed to remove unrecorded contaminants from the coupons, making the final weights lower than the initial. The coupons soiled with J90 and L.S. Starret Mobil DTE24 were still wet after a week of drying, so the mediums may not be compatible, or they could be wiped clean.
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