Alternatives were prepared to the following concentrations: Acetone 100%, Acetone 50%, Thiophene 100%, Cyclopentanone 100%, Anisole 100%, Dimethyl Glutarate 100%, and Ethyl Lactate 100%. Dimethyl Glutarate was heated to 150°F while the other alternatives were kept at room temperature. Three brass coupons were obtained and weighed for each of the solutions being tested. Coupons were then coated on one side with the lacquer soil and allowed to dry for 30 minutes. Once soiled and dry, a dirty weight was obtained and recorded for all coupons. Coupons were then submerged into their respective solutions for 30 minutes, checking the progress of cleaning every five minutes. Coupons were allowed air dry. Following the drying period, coupons were weighed again and a clean weight was recorded. Effectiveness of the cleaners was determined.
Trial Results:
Cleaner
Initial weight of Cont
Final weight of Cont
%Cont Removed
%AVG
100% Acetone
0.0263
-0.0012
104.56
95.93
0.0238
0.0016
93.28
0.0527
0.0053
89.94
50% Acetone
0.0364
0.0333
8.52
9.11
0.0391
0.0358
8.44
0.0241
0.0216
10.37
Thiophene
0.0307
0.0093
69.71
67.44
0.0333
0.0123
63.06
0.0289
0.0088
69.55
Cyclopentanone
0.0283
0.0345
-21.91
64.20
0.0248
-0.0025
110.08
0.0203
-0.0009
104.43
Anisole
0.0249
0.0028
88.76
91.11
0.0163
0.0008
95.09
0.0247
0.0026
89.47
Dimethyl Glutarate
0.0228
-0.0003
101.32
104.60
0.0322
-0.0021
106.52
0.0252
-0.0015
105.95
Ethyl Lactate
0.0290
0.0158
45.52
43.41
0.0343
0.0210
38.78
0.0233
0.0126
45.92
Dimethyl Glutarate was the most effective cleaner removing an average of 104.60% of lacquer from the brass substrates. Acetone 100% and Anisole were the secondary most effective solvent alternatives removing an average of 95.93% and 91.11% respectively. Percent removals over 100 indicate that the solvent has removed additional soils which were present on the coupon prior to testing.
During the cleaning process, all solutions excluding Acetone 50% underwent a color change from clear to a deep red almost immediately after adding coupons into the solution. This color change verifies that the solutions are able to remove the lacquer. Acetone 100%, Acetone 50%, Thiophene, and Cyclopentanone had partial to a fair amount of removal at the 10-minute mark. Anisole, Dimethyl Glutarate, and Ethyl Lactate showed similar removal by the 15-minute mark.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
From the percent effectiveness, Acetone 100%, Anisole, and Dimethyl Glutarate were chosen to proceed with to test on company parts.
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