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Does anything dissolve paint thinner
On Mon, 2 Sep 2019 18:28:52 -0700 (PDT), AK
wrote: On Monday, September 2, 2019 at 4:49:25 PM UTC-5, Jeff Liebermann wrote: On Mon, 2 Sep 2019 14:05:02 -0700 (PDT), AK wrote: You must never have used IPA on grease. Actually, I have. It works well at dissolving hydrocarbon based non-polar greases. It's also good for removing silicon grease from CPU's and heat sinks. Not so good as a pre-wash for removing grease stains. It does not dissolve grease, it requires an organic solvent. Andy Alcohol is an organic solvent because it contains carbon linked to hydrogen, oxygen, or nitrogen (except for carbonates, cyanides, carbides, etc). https://en.wikipedia.org/wiki/Isopropyl_alcohol ...it is used widely as a solvent and as a cleaning fluid, especially for dissolving oils isopropyl alcohol vs degreaser https://singletrackworld.com/forum/topic/isopropyl-alcohol-vs-degreaser/ IPA is a solvent, it dissolves grease (and water, and anything else) into itself, so you can wipe it away. Degreaser is a surfactant, so it allows the grease/oil to form microscopic globules in the water, which you then wash or wipe away. Its essentially concentrated soap. Both will do the same job, but degreaser works better at stripping large amounts of gunk off drivechains as the degreaser and oil form an emulsion, which you can then wash away. If you put IPA in a chain cleaner youd just be diluting the oil and it still wouldnt wash off. IPA works best for removing small amounts of gunk, or where you dont want to leave a trace of soap/water afterwards for example cleaning calipers and levers after bleeding brakes, or sloshing around in suspension forks to remove the last traces of the old oil and any dirt. By the way, you're welcome. isopropyl alcohol vs degreaser https://singletrackworld.com/forum/topic/isopropyl-alcohol-vs-degreaser/ IPA is a solvent, it dissolves grease (and water, and anything else) into itself, so you can wipe it away. I am a retired chemist with over 35 years of experience. And I had to dissolve many substances in order to run analyses and clean equipment. You can say all you want, but IPA NEVER HAS and NEVER WILL dissolve oils and greases. Andy Well, I guess I'll just have to try it. Found a tiny 50 ml beaker and added 10 ml of 91% IPA. I then dumped in a dime size blob of whatever greases I could find around the house. I then stirred the solution lightly (no stirring rod). If the grease dissolved into the IPA, then IPA can be used as a solvent to clean it. If it remained mostly intact, it's insoluble. After that, I found a white pine board, and ground a dime size spot of grease into the board with my thumb. I then wiped it clean with a paper towel. In all cases, there was some residue embedded in the wood. I then used a different paper towel to try and clean off the residue. If IPA was able to clean the embedded grease, then I would consider IPA a solvent. Soluble? Pine board Lithium white grease. Yes Yes 10-30wt engine oil. No Somewhat WD-40 No No 3-in-one oil. Yes Yes Unlabelled gear lube. Somewhat Yes Moly disulfide grease. No No Al2O3 thermal goo. Yes Most but not all LPS3 (wax film lube). Yes Yes Mystery black grease gun. Yes Most but not all The results showing "most but not all" seem to have left a solid particle residue in the grain of the wood which I could not remove with IPA and scrubbing. The greasy carrier was removed, but not the solid particles. Sorry, no photos because I didn't want to get grease all over my smartphone or camera. Maybe if I can dig up an accomplice, I can make a YouTube video and become famous. If I wanted to do it correctly, I would use a viscosity tester (tilting glass slide). Or, I could stir more vigorously, and use a centrifuge to see if the grease and IPA could be separated. If I feel ambitious or someone has a better idea, I can easily re-run the tests and add a few more greases that are more likely to be found on a bicycle chain. I can't conclude anything either way with what I'll readily admit are two rather lousy tests. Offhand, it would seem that some greases and oils will not dissolve in IPA, while others will to varying degrees. Meanwhile, I'll burn some time pondering all the web sites recommending IPA for grease and stain removal: https://www.google.com/search?q=alcohol+grease+removal Drivel: One thing that 91% IPA is good for is removing the sticky depolymerized rubber goo (paint) from the surface of computer keyboards, mice, toys, etc. (Thank you Logitech). I've had to recycle or toss far too much of this stuff simply because I couldn't remove the sticky goo. IPA works, but does require some heavy duty scrubbing. What's left is bare plastic, but that's better than dealing with the sticky rubberish mess. -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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