Isopropyl alcohol – also known as isopropanol – is commonly known as rubbing alcohol ✵. IPA (Isopropyl alcohol) is available from the pharmacy. It wears out (gold wiper hits the resin).Ĭlean it with pure alcohol. Don't drink any of it, work in ventilated spaces, and wash up when you are finished.Ī carbon pot (potentiometer) is a thin layer of pure carbon on a phenolic resin substrate.Īpart from electrical connection and mechanical failure, there are only two things that can go wrong.ġ. ![]() Many of these are classed as hazardous substances but the reason is not so much its persistence as its being a carcinogen, if I am right on this. A few drops will also kill an unwanted tree or bush. I also think a very powerful solvent is ordinary brake fluid. If this doesn't do it, I have the really powerful stuff waiting in the wings - first the denatured alcohol, which pretty much always gets it but can dissolve important stuff, and finally acetone which is really powerful. It's really benign and evaporates quickly. I have plenty of it and will never run out. ![]() I don't go as far back as carbon tetrachloride or methyl ethyl ketone but my favorite solvent is 1,1,1 trichloroethane. If that doesn't do the job I resort to left over hazardous chemicals I have had for years. My first solvent is often isopropyl rubbing alcohol.
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