The goal of this trial is to determine which chemistries would be a suitable substitution for ethanol.
From yesterday's experiment, six chemistries were chosen for reason of ink adhesion, low amount of residue and ease of drying. These six chemistries (Terpene Tech HTF-321, Oakite Inproclean 1300, Nalgene L900, Mirachem Corp. Mirachem 500, Man-Gil Gillite 0650-CI, MacDermid ND-17), were tested against isopropanol to determine their effectiveness in removing uncured inks and greases.
Fourteen switchboxes were contaminated. Seven switchboxes were spread with both the white and the black inks. The other seven switch parts were spread with both greases. One switchbox of each contaminant will be cleaned in a full-strength solution of each chemistry.
Cleaning took place for 15 minutes in a beaker with stir-bar agitation at room temperature.
After cleaning the parts were rinsed in tap water for 5 seconds and then left to dry under UV light for 10 minutes. To analyze cleanliness, parts were weighed before and after contamination and after cleaning and a percentage removal was determined.
SUBSTRATE MATERIAL: plastic switch parts
CONTAMINANTS: Markem black and white dies, dark and light greases. CONTAMINATING PROCESS USED: Rubbed on with swab.
Trial Results:
sample # and chemistry
Contaminant
clean mass (g)
mass with cont (g)
mass after cleaning (g)
contaminant removed (g)
Percent Removal
1-Isopropanol
inks
0.8518
0.8595
0.8531
0.0064
83.12%
8-Isopropanol
greases
0.8551
0.8647
0.8561
0.0086
89.58%
2-HTF321
inks
0.8486
0.8559
0.8526
0.0033
45.21%
9-HTF321
greases
0.8467
0.8634
0.8609
0.0025
14.97%
3-Inproclean 1300
inks
0.8505
0.8529
0.8514
0.0015
62.50%
10-Inproclean 1300
greases
0.8467
0.8617
0.8577
0.004
26.67%
4-Mirachem 500
inks
0.8524
0.8545
0.8524
0.0021
100.00%
11-Mirachem 500
greases
0.8497
0.8597
0.8541
0.0056
56.00%
5-Nalgene L900
inks
0.8508
0.8529
0.8519
0.001
47.62%
12-Nalgene L900
greases
0.8555
0.8650
0.8650
0.0000
0.00%
6-Gillite 0651CI
inks
0.8426
0.8467
0.8447
00.002
48.78%
13-Gillite 0651CI
greases
0.8466
0.8554
0.8526
0.0028
31.82%
7 ND-17
inks
0.8456
0.8486
0.8456
0.003
100.00%
14 ND-17
greases
0.8572
0.8690
0.8627
0.0063
53.39%
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Both the Mirachem Corp. Mirachem 500 and the Macdermid ND-17 were more effective in removing the inks than the isopropanol but were not as effective in removing the greases.
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