Trial Purpose:
Further evaluation for ethanol replacement
Date Run:
03/21/1996Experiment Procedure:
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.
