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Trial Number 3

Trial Purpose:

To test the effectiveness of HSPiP alternatives.

Date Run:

04/22/2021

Experiment Procedure:

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 0.029 0.0158 45.52 43.41
0.0343 0.021 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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