Trial #3
To test two solvents in cleaning oil and grease from stainless steel as an alternative to TCE using heated ultrasonics.
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 initial 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 heated ultrasonics. The coupons were immersed and subjected to ultrasonics agitation for 15 minutes at 130 degrees Farenheit. The coupons were then removed and left to dry overnight. (Coupons dried for a week before weights were taken). Clean weights were recorded.
| Cleaner
|
Soil
|
Substrate
|
Initial wt of cont.
|
Final wt of cont.
|
%Cont Removed
|
% AVG
|
% Overall
|
| SB-33
|
1
|
Stainless Steel
|
0.0191
|
0.0038
|
80.10
|
88.20
|
0.88
|
| Stainless Steel
|
0.0374
|
0.0040
|
89.30
|
| Stainless Steel
|
0.0729
|
0.0035
|
95.20
|
| 2
|
Stainless Steel
|
0.0279
|
0.0012
|
95.70
|
87.63
|
| Stainless Steel
|
0.0453
|
0.0042
|
90.73
|
| Stainless Steel
|
0.0204
|
0.0048
|
76.47
|
| SB-31
|
1
|
Stainless Steel
|
0.1060
|
0.0016
|
98.49
|
98.98
|
0.96
|
| Stainless Steel
|
0.1202
|
0.0006
|
99.50
|
| Stainless Steel
|
0.0662
|
0.0007
|
98.94
|
| 2
|
Stainless Steel
|
0.0284
|
0.0004
|
98.59
|
93.19
|
| Stainless Steel
|
0.0123
|
0.0016
|
86.99
|
| Stainless Steel
|
0.0100
|
0.0006
|
94.00
|
Coupons were left for a week after cleaning and were able to airdry during that time
SB-33 is an effective solvent in removing the soils from stainless steel coupons using heated ultrasonics. SB-31 is an effective solvent in removing the soils from stainless steel coupons using heated ultrasonics.
No relation