To find a cleaning chemistry that can dissolve the resin after hardening.
Date Run:
07/09/1998
Experiment Procedure:
Five cleaners from the previous trial and three new cleaners were tested. Each cleaner was used at full strength at room temperature.
Approximately 3 grams of the resin was placed into a 40 mL vial. Twenty mL of each cleaner was poured into the vials. The vials were then capped and shaken by hand for 30 seconds. The vials sat for three days. Observations were made after the last day.
SUBSTRATE MATERIAL: N/A
CONTAMINANTS: Formaldehyde Based Resin CONTAMINATING PROCESS USED: Contaminant placed in a vial.
Trial Results:
Table-1 lists the observations made after the third day of soaking.
Table-1. Observations
Cleaner Used
Weight of Resin (g)
Observations
Super CMF 240
2.8010
No dissolving
Daraclean 232
3.1207
Good dissolving
SC -1000
2.6634
Good dissolving
Bio-Safe 1023
2.8000
Some dissolving
HTF -50
3.1096
Some dissolving
HTF-60
2.7271
No dissolving
Resineater
2.8797
No dissolving
D-Limonene
3.0129
No dissolving
Both the Gemtek SC-1000 and WR Grace Daraclean 232 showed any significant dissolving of the resin in the solid phase. The solutions appeared cloudy and the resin appeared as if it was becoming gel-like. The cleaners with some dissolving were partly cloudy and the resin looked solid. Chemistries with no dissolving had no effect on the resin.
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
Two chemistries were effective in starting to dissolve the resin after three days at room temperature. Elevated temperatures may increase the rate at which the solutions react with the resin.
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