Trial #0
To test the efficacy of aqueous cleaners, solvents, alternative solvents, and modified alcohols in removing Drawell Heavy Machining Oil from brass coupons.
Preparation:
Brass coupons were used for the testing of several cleaning chemistries to remove a Drawell Heavy Machining Oil. Three coupons were used per each cleaning chemistry. Each coupon was weighed using a gravimetric balance and had their initial weights recorded. Drawell Heavy Machining Oil was applied to each coupon by swiping a swab across the bottom third of each coupon (avg ~0.15 grams of oil). Each coupon was then re-weighed and had their dirty weights recorded.
Cleaning Procedure:
Each coupon was cleaned via the method of manual wiping with a Wypall, with each Wypall having 2.5ml of cleaning solution applied. A new Wypall was used for each coupon. Each coupon was wiped down five times with a saturated Wypall. After cleaning, the coupons were re-weighed and had their clean weights recorded.
| Cleaner
|
Initial wt of cont.
|
Final wt of cont.
|
%Cont Removed
|
% AVG
|
| Dimethyl Glutarate (Solvent)
|
0.2009
|
0.0012
|
99.40
|
98.72
|
| 0.1401
|
0.0018
|
98.72
|
| 0.2334
|
0.0046
|
98.03
|
| Micro 90 2% solution
|
0.1125
|
0.0107
|
90.49
|
92.66
|
| 0.1861
|
0.0078
|
95.81
|
| 0.1479
|
0.0123
|
91.68
|
| Crystal Simple Green 10% solution
|
0.1119
|
0.0058
|
94.82
|
96.69
|
| 0.1552
|
0.0026
|
98.32
|
| 0.1503
|
0.0046
|
96.94
|
| Metalnox M6386 (mod. alc.)
|
0.0837
|
0.0003
|
99.64
|
99.65
|
| 0.0921
|
0.0002
|
99.78
|
| 0.0848
|
0.0004
|
99.53
|
No visible or tactile residue of the Drawell Heavy Machining Oil present after cleaning
No visible or tactile residue of any of the cleaning solutions present after cleaning
EHS:
|
|
Zep ID Red
|
Safety Kleen Premium Solvent
|
Dimethyl Glutarate
|
Crystal Simple Green Industrial Cleaner & Degreaser
|
Metalnox M6386 (modified alcohol)
|
| Acute Human Effects
|
8
|
8
|
2
|
5
|
8
|
| Chronic Human Effects
|
10
|
10
|
2
|
5
|
2
|
| Ecological Hazards
|
8
|
8
|
3
|
2
|
4
|
| Environmental Fate & Transport
|
8
|
8
|
8
|
2
|
5
|
| Atmospheric Hazard
|
2
|
2
|
2
|
2
|
2
|
| Physical Properties
|
9
|
8
|
5
|
6
|
8
|
| Process Factors
|
6
|
6
|
4
|
5
|
4
|
| Life Cycle Factors
|
7
|
7
|
3
|
4
|
4
|
| Overall Hazard Score
|
7.3
|
7.1
|
3.6
|
3.9
|
4.6
|
The Metalnox M6386 (modified alcohol) was the most effective in removing the machining oil. The modified alcohol can be used as a short-term solution using manual wiping and can be transitioned into a long-term solution using vacuum vapor degreasing or a closed ultrasonics system.
The Crystal Simple Green was also effective and can be used as a short term solution. Although its performance shows a slightly lower removal percentage than the Metalnox M6386, there was no visible or tactile difference between the coupons cleaned these chemistries. Crystal Simple Green is priced at a lower price point than the currently used Zep ID Red.
The Dimethyl Glutarate (solvent) was also highly effective but can be quite expensive. Future testing can focus on StaSol, a commercial (less costly) form of Dimethyl Glutarate.
No relation