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Trial Number 1

Trial Purpose:

Further evaluation for ethanol replacement

Date Run:

03/21/1996

Experiment 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 reaseon 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 contaminants will be cleaned in a full strength solution of each chemistry.
Cleaning took place for 15 minutes in a beaker with stirbar agitation at room temperature.
After cleaning the parts were rinsed in tap water for 5 seconds and then let to dry under UV light for 10 minutes.
To analyse 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

 

.8518

 

.8595

 

.8531

 

0.0064

 

83.12%

 

8-Isopropanol

 

greases

 

.8551

 

.8647

 

.8561

 

0.0086

 

89.58%

 

2-HTF321

 

inks

 

.8486

 

.8559

 

.8526

 

0.0033

 

45.21%

 

9-HTF321

 

greases

 

.8467

 

.8634

 

.8609

 

0.0025

 

14.97%

 

3-Inproclean 1300

 

inks

 

.8505

 

.8529

 

.8514

 

0.0015

 

62.50%

 

10-Inproclean 1300

 

greases

 

.8467

 

.8617

 

.8577

 

0.004

 

26.67%

 

4-Mirachem 500

 

inks

 

.8524

 

.8545

 

.8524

 

0.0021

 

100.00%

 

11-Mirachem 500

 

greases

 

.8497

 

.8597

 

.8541

 

0.0056

 

56.00%

 

5-Nalgene L900

 

inks

 

.8508

 

.8529

 

.8519

 

0.001

 

47.62%

 

12-Nalgene L900

 

greases

 

.8555

 

.8650

 

.8650

 

0

 

0.00%

 

6-Gillite 0651CI

 

inks

 

.8426

 

.8467

 

.8447

 

0.002

 

48.78%

 

13-Gillite 0651CI

 

greases

 

.8466

 

.8554

 

.8526

 

0.0028

 

31.82%

 

7 ND-17

 

inks

 

.8456

 

.8486

 

.8456

 

0.003

 

100.00%

 

14 ND-17

 

greases

 

.8572

 

.8690

 

.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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