Timeline for Risks from overheated phenolphthalein in green/orange silica gel drying
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 9, 2020 at 13:36 | comment | added | Gus | * marketed as not bad | |
| Jul 9, 2020 at 2:47 | vote | accept | Gus | ||
| Jul 9, 2020 at 2:47 | comment | added | Gus | Hmm, well for some reason my google foo is better today. I just found something about Methyl-Violet-2B as a silica dye, so you're probably right that this is not phenolphthalein. This seems disheartening since the orange stuff is marketed as bad for the environment, and maybe it's not as not bad as cobalt blue, but it's still very toxic to fish and aquatic life datasheets.scbt.com/sc-206052.pdf | |
| Jul 9, 2020 at 2:21 | comment | added | Gus | Hmm although your PDF does seem to say that the thymolphtaline is dark when dry, so I guess the source of greenish color is unknown and possibly more limiting than the orange... I've not found description of any other orange colored formulation though (not that I'm likely to have the resources for an exhaustive search though) | |
| Jul 9, 2020 at 2:12 | comment | added | Gus | I found something regarding my specific brand, and it said 200-250F which sounds like maybe it's (3)... and anything containing phenolphthalein will of course be limited to temps that can be sustained by phenolphthalein. The pellets were placed directly from the distribution container into an polyethylene container next to 3d printer printing PLA, so the only likely contaminant would be PLA dust, but whole silica beads turned black and significant smoke was produced. | |
| Jun 22, 2020 at 21:09 | history | answered | Mathew Mahindaratne | CC BY-SA 4.0 |