Trial #1
To test two solvents in cleaning oil and grease from stainless steel as an alternative to TCE using heated 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 heated immersion. The coupons were immersed for 15 minutes with a stir bar set to 200 rpm at a temperature of 130 F. The coupons were then removed and left to dry overnight. The next morning clean weights were recorded.
| Cleaner
|
Soil
|
Substrate
|
Initial wt of cont.
|
Final wt of cont.
|
%Cont Removed
|
% AVG
|
% Overall
|
| SB-33
|
Hocut 795
|
Stainless Steel
|
0.0890
|
0.0017
|
98.09
|
96.85
|
92.84
|
| Stainless Steel
|
0.0482
|
0.0037
|
92.32
|
| Stainless Steel
|
-0.4185
|
0.0006
|
100.14
|
| RI 780
|
Stainless Steel
|
0.0282
|
0.0026
|
90.78
|
88.82
|
| Stainless Steel
|
0.0320
|
0.0061
|
80.94
|
| Stainless Steel
|
0.0286
|
0.0015
|
94.76
|
| SB-31
|
Hocut 795
|
Stainless Steel
|
0.1144
|
0.0151
|
86.80
|
84.73
|
86.06
|
| Stainless Steel
|
0.1247
|
0.0194
|
84.44
|
| Stainless Steel
|
0.0721
|
0.0123
|
82.94
|
| RI 780
|
Stainless Steel
|
0.0403
|
0.0008
|
98.01
|
87.38
|
| Stainless Steel
|
0.0301
|
0.0091
|
69.77
|
| Stainless Steel
|
0.0515
|
0.0029
|
94.37
|
The coupons associated with solvent SB31 were still partially wet after being left to air dry overnight.
Both SB-33 and SB-31 are effective in removing oil and grease from stainless steel coupons using heated immersion. SB-31 may need a drying application after cleaning in order to be used in a company application.
No relation