Continuing the discussion from Replacing Isopropyl Alcohol with Yellow Magic:
As part of our ongoing quest to find a replacement for isopropyl alcohol during post-print clean-up, I ran a test comparing its use against two products from Bradley Systems: Yellow Magic-7 and RTX-9.
Free samples are graciously provided by the team at Bradley Systems to any FormLabs Support Forum user who requests it:
Results: In short, neither product completely eliminated the need for at least a short IPA bath. However both products did a very good job replacing IPA in the First Stage cleaning process. Yellow Magic has the added benefit of being more resuable than either IPA or RTX.
This test focused on the use of castable resin, since it requires an extended UV cure step. Our hope was the UV cure would help to remove the ‘tackiness’ left behind by YM and RTX and make IPA unnecessary.
Freshly printed parts were submerged in each solution and agitated. Both YM and RTX are water-based, so are able to be used safely in an ultrasonic cleaner.
Since they are less volatile than IPA, it’s easy to add a quick scrub with a chip brush to the process with YM and RTX.
All pieces were dried with compressed after the First Stage cleaning. A quick IPA bath was given to one print-out from each cleaner for later comparison to “cleaner only” parts.
The prints were then exposed to a UV cure for an extended period of time.
The best results continue to be parts put through a double IPA bath, but a Yellow Magic initial bath followed by a quick IPA rinse is nearly indistinguishable.
The YM and RTX “cleaner only” baths created parts that failed to fully cure, remaining somewhat ‘tacky’ even after the extended UV cure. Neither product alone produced parts ready for investment casting.
Yellow Magic continues to have the added benefit of reusability. A quick exposure to sunlight or a UV curing box solidifies the captured resin, allowing the solution to be reused. The RTX is a more aggressive cleaner, and is mixed with water-- perhaps the reason why it congealed when exposed to UV.