Trial #0
To test two solvents in cleaning oil and grease from stainless steel as an alternative to TCE using unheated immersion.
Two solvents were identified previously using the HSPiP software; SB-33 (D-limonene 85% +Dimethyl glutarate 15%) and SB-31 (Benzyl alcohol 63% + Ethyl lactate 37%). Twelve stainless steel coupons were chosen and intial weights of each were recorded. Half of the coupons were soiled with Hocut 795 and half were soiled with RI-780. The soils were applied to the bottom third of each coupon using a swab. The coupons were then cleaned by their respective solvent using a method of unheated immersion. The coupons were immersed for 15 minutes with a stir bar set to 200 rpm. The coupons were then removed and left to dry overnight. The next morning clean weights were recorded.
| Cleaner
|
Soil
|
Substrate
|
Initial wt
|
Dirty wt
|
Clean wt.
|
Initial wt of cont.
|
Final wt of cont.
|
%Cont Removed
|
% AVG
|
% Overall
|
| SB-33
|
Hocut 795
|
Stainless Steel
|
59.0069
|
59.0317
|
59.0122
|
0.0248
|
0.0053
|
78.63
|
73.09
|
79.61
|
| Stainless Steel
|
60.3367
|
60.3888
|
60.3418
|
0.0521
|
0.0051
|
90.21
|
| Stainless Steel
|
63.8959
|
63.9072
|
63.9015
|
0.0113
|
0.0056
|
50.44
|
| RI 780
|
Stainless Steel
|
63.9891
|
64.0096
|
63.993
|
0.0205
|
0.0039
|
80.98
|
86.12
|
| Stainless Steel
|
63.8677
|
63.8856
|
63.8679
|
0.0179
|
0.0002
|
98.88
|
| Stainless Steel
|
59.9843
|
60.0029
|
59.9883
|
0.0186
|
0.0040
|
78.49
|
| SB-31
|
Hocut 795
|
Stainless Steel
|
58.9639
|
59.0367
|
59.0014
|
0.0728
|
0.0375
|
48.49
|
38.64
|
68.95
|
| Stainless Steel
|
60.088
|
60.1232
|
60.1211
|
0.0352
|
0.0331
|
5.97
|
| Stainless Steel
|
59.1426
|
59.2225
|
59.1734
|
0.0799
|
0.0308
|
61.45
|
| RI 780
|
Stainless Steel
|
60.2134
|
60.242
|
60.2179
|
0.0286
|
0.0045
|
84.27
|
99.27
|
| Stainless Steel
|
60.1841
|
60.214
|
60.1874
|
0.0299
|
0.0033
|
88.96
|
| Stainless Steel
|
49.5706
|
49.5942
|
49.5648
|
0.0236
|
-0.0058
|
124.58
|
SB-33 was able to completely air dry overnight. SB-31 did not air dry overnight and left pools of solvent on the coupons. The final weights of these coupons include the weight of the left over solvent. This means that SB-31 would most likely be effective with a drying step.
SB-33 was successful in removing both soils from the coupons using unheated immersion. SB-31 was successful in removing RI 780 from the coupons using unheated immersion. It was not successful in removing Hocut 795 from the coupons using unheated immersion.
No relation