To evaluate the effectiveness of SB-16 (a FAME + Methyl Lactate mixture) in removing several production oils and greases from stainless steel coupons as a potential replacement for TCE using heated ultrasonics cleaning method.
Date Run:
04/13/2023
Experiment Procedure:
Three stainless steel coupons were used for each of the five soils being tested for a total of 15 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 to heated ultrasonics cleaning in a solution of Fatty Acid Methyl Ester 93% + Ethyl Lactate 7% for 15 minutes at 130 F. After the coupons were cleaned, they dried with a heat gun for about 2 minutes each. The next morning, the clean weights of each coupon were taken
Soil
Use
CAS
Milform OAK 7a International
Stamping and drawing fluid
64742-53-6 / 68909-65-9
Milform Oak 529
Evaporative lubricant
68551-17-7 / 123-95-5 / 127087-87-0
Milform Oak 15a
Metalworking oil
64742-44-5 / 64742-52-5 / 64742-55-8
Milform Oak 15c
Metalworking oil
64742-52-5 / 64742-53-6
M4
Trial Results:
Solvent
Substrate
Soil
Initial wt of cont.
Final wt of cont.
%Cont Removed
% AVG
% Overall
Fatty Acid methyl ester 93% + Ethyl lactate 7%
Stainless Steel
Oak 7a international
0.0753
0.0308
59.10
67.74
72.69
Oak 7a international
0.0635
0.0202
68.19
Oak 7a international
0.0781
0.0188
75.93
M4
0.1500
0.0254
83.07
82.94
M4
0.2122
0.0416
80.40
M4
0.1380
0.0202
85.36
Oak 15C
0.0709
0.0118
83.35
80.84
Oak 15C
0.0775
0.0154
80.13
Oak 15C
0.1068
0.0224
79.03
Oak 15A
0.1911
0.0158
91.73
87.13
Oak 15A
0.1891
0.0244
87.10
Oak 15A
0.1571
0.0274
82.56
Oak 529
0.0273
0.0152
44.32
44.80
Oak 529
0.0309
0.0231
25.24
Oak 529
0.0330
0.0116
64.85
When the coupons were dried with a heat gun for 2 minutes each, a white vapor was emitted in the fume hood.
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-16 (Fatty Acid Methyl Ester 93% + Ethyl Lactate 7%) is an effective cleaner for soils M4, Oak 15C, and Oak 15a if a drying step is feasible. It is not an effective cleaner for soils Oak 7a international and Oak 529.
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